How to install latest gcc on Ubuntu LTS (12.04, 14.04, 16.04)

how-to-install-latest-gcc-on-ubuntu-lts.txt

These commands are based on a askubuntu answer http://askubuntu.com/a/581497
To install gcc-6 (gcc-6.1.1), I had to do more stuff as shown below.
USE THOSE COMMANDS AT YOUR OWN RISK. I SHALL NOT BE RESPONSIBLE FOR ANYTHING.
ABSOLUTELY NO WARRANTY.

If you are still reading let's carry on with the code.

sudo apt-get update && \
sudo apt-get install build-essential software-properties-common -y && \
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \
sudo apt-get update && \
sudo apt-get install gcc-snapshot -y && \
sudo apt-get update && \
sudo apt-get install gcc-6 g++-6 -y && \
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6 && \
sudo apt-get install gcc-4.8 g++-4.8 -y && \
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8;

When completed, you must change to the gcc you want to work with by default. Type in your terminal:
sudo update-alternatives --config gcc

To verify if it worked. Just type in your terminal
gcc -v

If everything went fine you should see gcc 6.1.1  by the time I am writing this gist

Happy coding!

See my blog post at https://www.application2000.com

Worked without any issues on a new install of Ubuntu 16.04. Thank you..

worked perfectly thanks.

Thank You

g++-6 : Depends: gcc-6-base (= 6.1.1-2ubuntu12~16.04) but 6.1.1-3ubuntu11~14.04.1 is to be installed
         Depends: libstdc++-6-dev (= 6.1.1-2ubuntu12~16.04) but it is not going to be installed
 gcc-6 : Depends: cpp-6 (= 6.1.1-2ubuntu12~16.04) but it is not going to be installed
         Depends: gcc-6-base (= 6.1.1-2ubuntu12~16.04) but 6.1.1-3ubuntu11~14.04.1 is to be installed
         Depends: libgcc-6-dev (= 6.1.1-2ubuntu12~16.04) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

This worked fine today.

update-alternatives --config gcc
There are 2 choices for the alternative gcc (providing /usr/bin/gcc).
`

Selection Path Priority Status

• 0 /usr/bin/gcc-6 60 auto mode
  1 /usr/bin/gcc-4.8 60 manual mode
  2 /usr/bin/gcc-6 60 manual mode

Press to keep the current choice[*], or type selection number:`

Thanks!

Very helpful, thank you

Thanks, worked great!

I modified it slightly to keep the default 16.04 gcc-5 around:

 sudo apt-get update && \
 sudo apt-get install build-essential software-properties-common -y && \
 sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \
 sudo apt-get update && \
 sudo apt-get install gcc-snapshot -y && \
 sudo apt-get update && \
 sudo apt-get install gcc-6 g++-6 -y && \
 sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6 && \
-sudo apt-get install gcc-4.8 g++-4.8 -y && \
-sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8;
+# Already installed gcc-5 as part of build-essential; I didn't need this line..
+# sudo apt-get install gcc-5 g++-5 -y && \
+sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 60 --slave /usr/bin/g++ g++ /usr/bin/g++-5;

Thanks. Worked perfectly. :)

Hi, i am getting below error while trying to upgrade gcc,

root@compute:/tmp# sudo apt-get update && \

sudo apt-get install build-essential software-properties-common -y &&
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y &&
sudo apt-get update &&
sudo apt-get install gcc-snapshot -y &&
sudo apt-get update &&
sudo apt-get install gcc-6 g++-6 -y &&
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6 &&
-sudo apt-get install gcc-4.8 g++-4.8 -y &&
-sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8;
Hit:1 http://ppa.launchpad.net/ubuntu-toolchain-r/ppa/ubuntu xenial InRelease
Ign:2 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/newton InRelease
Hit:3 http://in.archive.ubuntu.com/ubuntu xenial InRelease
Hit:4 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial InRelease
Hit:5 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/newton Release
Get:7 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Get:8 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Get:9 http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Fetched 306 kB in 1s (199 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
build-essential is already the newest version (12.1ubuntu2).
build-essential set to manually installed.
software-properties-common is already the newest version (0.96.20.4).
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
cpp-5 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
g++-5 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
gcc-5 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libasan2 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libatomic1 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libcc1-0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libcilkrts5 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libgcc-5-dev : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libgomp1 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libitm1 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
liblsan0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libmpx0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libquadmath0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libstdc++-5-dev : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libstdc++-5-dev:i386 : Depends: gcc-5-base:i386 (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
Depends: libgcc-5-dev:i386 (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
Depends: libstdc++6:i386 (>= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
Depends: libc6-dev:i386 (>= 2.13-0ubuntu6) but it is not going to be installed
libstdc++6 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libtsan0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libubsan0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

please help me to short it out.

root@compute:/tmp# update-alternatives --config gcc
update-alternatives: error: no alternatives for gcc

Good Stuff!! thank you worked great on Ubuntu 16.0.4

nice, just need it for clang 3.9 for Travis CI.

Hash sum mismatches when running apt-get update can be resolved by flushing metadata. Without the ability to update, the gcc-6 and g++-6 packages won't be available for install.

what does the '-y' at the end of the line?

Nice, thank you very much

the -y flag causes apt-get to assume "yes" when it would normally prompt you with a yes /no question

This is great
Gcc version 6.2.0

Work very well for me, I had problems after update my kernel version with vmware.

Thanks!

GCC 9.1.0 on Ubuntu 14.04 & 16.04 & 18.04:

sudo apt-get update -y && 
sudo apt-get upgrade -y && 
sudo apt-get dist-upgrade -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-9 g++-9 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-9 && 
sudo update-alternatives --config gcc

select gcc-9

Hopefully it could help someone. Take care and Have a nice day. Cheers.

GCC 7.1 on Ubuntu 14.04 & 16.04:

sudo apt-get update -y && \
sudo apt-get upgrade -y && \
sudo apt-get dist-upgrade -y && \
sudo apt-get install build-essential software-properties-common -y && \
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \
sudo apt-get update -y && \
sudo apt-get install gcc-7 g++-7 -y && \
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60 --slave /usr/bin/g++ g++ /usr/bin/g++-7 && \
sudo update-alternatives --config gcc

Work very well for me.

Thanks!

@peterhanneman Thank you for the update. Take care

thank you ivanmara555 worked on 16.04 LTS..
Sat Jun 24 2017 GMT

thank you , this work very well !

Thank you! This works on Debian as well but instead of adding the Ubuntu repo you can add deb http://ftp.us.debian.org/debian testing main contrib non-free to the end of /etc/apt/sources.list

Thanks, this worked for me on Ubuntu 16.04.

Thanks for the tip @1Forge. Thank you all for your comments. Hope it helps everybody. Happy coding!

Thank you peterhanneman. Your one-liner worked perfectly.

This is gold dust! Many thanks.

Bro are you serious right now?! This worked like a fucking dream!

Thank you, solved an issue on Ubuntu 17.04

Thank you very much. Upgraded from 5 to 6.3

Thanks, confirmed works on WSL Ubuntu 16.04

worked fine! Thanks a lot :)

Excellent! Still works from 4.9.3 to 6.3! Very helpful thank you!

excellent! thanks very much!

Thank you! Such good directions. Worked like a charm.

It works. Thanks!

Thanks .Very helpfull !!

This is not correct. if i type "sudo apt-get install gcc-6 g++-6 -y" command, it says "E: Unable to locate package gcc-6" and then "E: Unable to locate package g++-6" and then "E: Couldn't find any package by regex 'g++-6'".

Thanks @peterhanneman!

Great work. 4.8 worked fantastically to compile mysql-python 1.2.5. Thanks!

Awesome walk through. In detail and no nonsense! Thank you

Works great! Thanks.

WARNING @application2000 @mdhanasar @GHnubsST @@AnanthanM @yech1990 @zxshoe @andrewrech @jwarlander @Sakib37 @ArulrajAnto @HungryHowies @AraHaan @KyCodeHuynh @S0ulR3av3R @talland @jasonbeach @smac89 @zheive @ivanmara555 @peterhanneman @toffyjan @k-five @hanzin @smutandwa @jlettvin @paberline @komeilr @NemoDomum @justinjk007 @SwapnilBorse123 @MostertMB @siebeniris @amendment19 @RianWardana
@vikchopde @zixuan75 @thinkjrs @NickWoodhams @cryptomaniac26 @awwsmm

The ppa:ubuntu-toolchain-r/test has old compiler builds that don't correctly compile some dkms kernel drivers, like nVidia, and you can get your installation pretty broken with the compilers from this PPA. See this launchpad issue for details.

That article is really informative! Thanks.

This might not be the right place to ask for it, but is there a possibility to install llvm + clang 5 toolchain for ubuntu 14.04 for armhf? I found ppa which has x86 and amd64, also 16.04 and newer have it in their repos? gcc is a bit buggy on arm, and also very demanding with memory consumption -_- where clang is just a blast. Faster in compiling, memory cut down by 50 to 80% (tested with amd64 and firefox), and also faster binaries.

Will llvm-4 and llvm-5 be added to trusty, as firefox seems to now depend on at least llvm-4?

It works, for me when I've tried to install strongswan from source code! 👍

It works, thank you :)

Thanks, it works!

Works like a charm!

works perfectly!

GCC 9.1.0 on Ubuntu 14.04 & 16.04 & 18.04:

sudo apt-get update -y && 
sudo apt-get upgrade -y && 
sudo apt-get dist-upgrade -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-9 g++-9 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-9 && 
sudo update-alternatives --config gcc

select gcc-9

ivanmara555 thanks that works great on my Ubuntu 16 install!

THANK YOU! I have been searching for a solution nearly 10 hours, and finally your method works for me!

method above now install gcc 8.1.0 ... Congratulations!)

@ivanmara555 , I used above command, but only gcc 8.0.1 is installed (not 8.1.0).

gcc --version
gcc (Ubuntu 8-20180424-0ubuntu1~16.04.1) 8.0.1 20180424 (experimental) [trunk revision 259590]

My platform is Ubuntu 16.04.4 LTS. Could you please help to point out what's wrong?

@F001 I got into the same situation on Ubuntu 14.04.5 LTS.

Many thanks.. it works greats :)

Worked, Thank you very much

thanks

Nicely done and much appreciated. Thank you @ivanmara555 et al.

Love you sir, it worked !

sudo apt-get install python-software-properties needed for Ubuntu 12.04 in order to run add-apt-repository

Thank you!

http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/dists/jessie/main/binary-amd64/Packages 404 Not Found

The whole jessie folder is gone. All other distros are there.

Great !! saved a lot of time.

Here is the Docker friendly format

FROM ubuntu:18.04
RUN apt-get update ; apt-get upgrade -y ; apt-get install -y gcc-8 g++-8 && \
  update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-8 && \
  update-alternatives --config gcc

also available on https://hub.docker.com/r/88plug/gcc-8-ubuntu-18.04/

Thank you!

thanks a lot :)

hi...
guide to install the update of GCC 8.2 or GCC 9.0 in Ubuntu 14.04 and 16.04 ???

Thanks!

Thank you @peterhanneman.

Thank you very much @ivanmara555
I test on ubuntu 16.04.5 without upgrading:

sudo apt-get update -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-8 g++-8 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-8 && 
sudo update-alternatives --config gcc

select gcc-8

And the final version of gcc is 8.1.0. @F001

Thanks. It works perfectly!

Thank you a lot but I'm getting confused if the g++ was well install, because I got error during the installation

update-alternatives: error: no alternatives for g++
I was installing main:gcc-6 g++6 then:gcc-7 g++-7

Then when I did g++ -v, I got:
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/6/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 6.5.0-2ubuntu116.04' --with-bugurl=file:///usr/share/doc/gcc-6/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --with-as=/usr/bin/x86_64-linux-gnu-as --with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-6 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-6-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-6-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-6-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 6.5.0 20181026 (Ubuntu 6.5.0-2ubuntu116.04)

thanks @peterhanneman
it solves my problem.

Not working on UBUNTU 12.04, below the errors

sameh@sameh-HP-EliteBook-2570p:~$ sudo apt-get update && \

sudo apt-get install build-essential software-properties-common -y &&
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y &&
sudo apt-get update &&
sudo apt-get install gcc-snapshot -y &&
sudo apt-get update &&
sudo apt-get install gcc-6 g++-6 -y &&
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6 &&
sudo apt-get install gcc-4.8 g++-4.8 -y &&
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8;
[sudo] password for sameh:
Hit http://security.ubuntu.com precise-security Release.gpg
Hit http://at.archive.ubuntu.com precise Release.gpg
Hit http://at.archive.ubuntu.com precise-updates Release.gpg
Hit http://at.archive.ubuntu.com precise-backports Release.gpg
Hit http://archive.canonical.com precise Release.gpg
Hit http://extras.ubuntu.com precise Release.gpg
Hit http://at.archive.ubuntu.com precise Release
Hit http://at.archive.ubuntu.com precise-updates Release
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://security.ubuntu.com precise-security Release
Hit http://at.archive.ubuntu.com precise-backports Release
Hit http://archive.canonical.com precise Release
Hit http://extras.ubuntu.com precise Release
Hit http://at.archive.ubuntu.com precise/main Sources
Hit http://at.archive.ubuntu.com precise/restricted Sources
Hit http://at.archive.ubuntu.com precise/universe Sources
Hit http://at.archive.ubuntu.com precise/multiverse Sources
Hit http://at.archive.ubuntu.com precise/main i386 Packages
Hit http://at.archive.ubuntu.com precise/restricted i386 Packages
Hit http://at.archive.ubuntu.com precise/universe i386 Packages
Hit http://at.archive.ubuntu.com precise/multiverse i386 Packages
Hit http://at.archive.ubuntu.com precise/main TranslationIndex
Hit http://at.archive.ubuntu.com precise/multiverse TranslationIndex
Hit http://security.ubuntu.com precise-security/main Sources
Hit http://at.archive.ubuntu.com precise/restricted TranslationIndex
Hit http://at.archive.ubuntu.com precise/universe TranslationIndex
Hit http://at.archive.ubuntu.com precise-updates/main Sources
Get:1 http://dl.google.com stable Release.gpg [819 B]
Hit http://at.archive.ubuntu.com precise-updates/restricted Sources
Hit http://at.archive.ubuntu.com precise-updates/universe Sources
Hit http://archive.canonical.com precise/partner i386 Packages
Hit http://extras.ubuntu.com precise/main Sources
Hit http://at.archive.ubuntu.com precise-updates/multiverse Sources
Hit http://at.archive.ubuntu.com precise-updates/main i386 Packages
Hit http://at.archive.ubuntu.com precise-updates/restricted i386 Packages
Hit http://at.archive.ubuntu.com precise-updates/universe i386 Packages
Hit http://at.archive.ubuntu.com precise-updates/multiverse i386 Packages
Hit http://at.archive.ubuntu.com precise-updates/main TranslationIndex
Hit http://security.ubuntu.com precise-security/restricted Sources
Hit http://security.ubuntu.com precise-security/universe Sources
Hit http://security.ubuntu.com precise-security/multiverse Sources
Hit http://security.ubuntu.com precise-security/main i386 Packages
Hit http://security.ubuntu.com precise-security/restricted i386 Packages
Hit http://ppa.launchpad.net precise Release
Hit http://at.archive.ubuntu.com precise-updates/multiverse TranslationIndex
Hit http://at.archive.ubuntu.com precise-updates/restricted TranslationIndex
Hit http://at.archive.ubuntu.com precise-updates/universe TranslationIndex
Hit http://at.archive.ubuntu.com precise-backports/main Sources
Hit http://security.ubuntu.com precise-security/universe i386 Packages
Hit http://security.ubuntu.com precise-security/multiverse i386 Packages
Hit http://security.ubuntu.com precise-security/main TranslationIndex
Hit http://security.ubuntu.com precise-security/multiverse TranslationIndex
Hit http://security.ubuntu.com precise-security/restricted TranslationIndex
Hit http://archive.canonical.com precise/partner TranslationIndex
Hit http://extras.ubuntu.com precise/main i386 Packages
Ign http://extras.ubuntu.com precise/main TranslationIndex
Hit http://at.archive.ubuntu.com precise-backports/restricted Sources
Hit http://at.archive.ubuntu.com precise-backports/universe Sources
Hit http://at.archive.ubuntu.com precise-backports/multiverse Sources
Hit http://at.archive.ubuntu.com precise-backports/main i386 Packages
Hit http://at.archive.ubuntu.com precise-backports/restricted i386 Packages
Hit http://at.archive.ubuntu.com precise-backports/universe i386 Packages
Hit http://at.archive.ubuntu.com precise-backports/multiverse i386 Packages
Hit http://at.archive.ubuntu.com precise-backports/main TranslationIndex
Hit http://at.archive.ubuntu.com precise-backports/multiverse TranslationIndex
Hit http://at.archive.ubuntu.com precise-backports/restricted TranslationIndex
Hit http://archive.canonical.com precise/partner Translation-en
Hit http://security.ubuntu.com precise-security/universe TranslationIndex
Hit http://at.archive.ubuntu.com precise-backports/universe TranslationIndex
Hit http://at.archive.ubuntu.com precise/main Translation-en
Hit http://at.archive.ubuntu.com precise/multiverse Translation-en
Hit http://at.archive.ubuntu.com precise/restricted Translation-en
Hit http://at.archive.ubuntu.com precise/universe Translation-en
Hit http://at.archive.ubuntu.com precise-updates/main Translation-en
Hit http://at.archive.ubuntu.com precise-updates/multiverse Translation-en
Hit http://at.archive.ubuntu.com precise-updates/restricted Translation-en
Hit http://at.archive.ubuntu.com precise-updates/universe Translation-en
Hit http://at.archive.ubuntu.com precise-backports/main Translation-en
Hit http://security.ubuntu.com precise-security/main Translation-en
Hit http://security.ubuntu.com precise-security/multiverse Translation-en
Hit http://at.archive.ubuntu.com precise-backports/multiverse Translation-en
Hit http://at.archive.ubuntu.com precise-backports/restricted Translation-en
Hit http://at.archive.ubuntu.com precise-backports/universe Translation-en
Hit http://ppa.launchpad.net precise/main Sources
Hit http://security.ubuntu.com precise-security/restricted Translation-en
Hit http://security.ubuntu.com precise-security/universe Translation-en
Hit http://dl.google.com stable Release
Ign http://dl.google.com stable Release
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://extras.ubuntu.com precise/main Translation-en_US
Ign http://extras.ubuntu.com precise/main Translation-en
Hit http://ppa.launchpad.net precise/main TranslationIndex
Ign http://dl.google.com stable/main TranslationIndex
Hit http://ppa.launchpad.net precise/main Translation-en
Err http://dl.google.com stable/main i386 Packages
404 Not Found [IP: 2a00:1450:4016:80c::200e 80]
Ign http://dl.google.com stable/main Translation-en_US
Ign http://dl.google.com stable/main Translation-en
Fetched 819 B in 3s (228 B/s)
W: GPG error: http://dl.google.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6494C6D6997C215E
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/main/binary-i386/Packages 404 Not Found [IP: 2a00:1450:4016:80c::200e 80]

Worked like a charm for me. Thanks a ton.

GCC 9.1.0 on Ubuntu 14.04 & 16.04 & 18.04:

sudo apt-get update -y && 
sudo apt-get upgrade -y && 
sudo apt-get dist-upgrade -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-9 g++-9 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-9 && 
sudo update-alternatives --config gcc

select gcc-9

Thank you!!

Thanks @peterhanneman

GCC 7.1 on Ubuntu 14.04 & 16.04:

sudo apt-get update -y && \
sudo apt-get upgrade -y && \
sudo apt-get dist-upgrade -y && \
sudo apt-get install build-essential software-properties-common -y && \
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \
sudo apt-get update -y && \
sudo apt-get install gcc-7 g++-7 -y && \
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60 --slave /usr/bin/g++ g++ /usr/bin/g++-7 && \
sudo update-alternatives --config gcc

Just in case if someone wants to make multilib ( gcc/g++ -m32 ) work then they also need to install gcc multilib packages

apt-get install gcc-<ver>-multilib lib32stdc++-<ver>-dev lib32gcc-<ver>-dev lib32objc-<ver>-dev

in my case <ver> is 9

GCC 9.1.0 on Ubuntu 14.04 & 16.04 & 18.04:

sudo apt-get update -y && 
sudo apt-get upgrade -y && 
sudo apt-get dist-upgrade -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-9 g++-9 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-9 && 
sudo update-alternatives --config gcc

select gcc-9

Thank you very much worked for me as well on 16.04

GCC 9.2.1 on Ubuntu 14.04 & 16.04 & 18.04:

sudo apt-get update -y && 
sudo apt-get upgrade -y && 
sudo apt-get dist-upgrade -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-9 g++-9 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-9 && 
sudo update-alternatives --config gcc

select gcc-9

@ivanmara555
Thanks

for gcc-3.4 or any older versions of gcc?

@ivanmara555
Thanks, bud

Thanks a lot ! It worked like charm in difficult setup.

@ivanmara555 Thankss, it's work on 16.04

Thanks a lot ! for gcc-4.9?

GCC 10.1.0 on Ubuntu 16.04 & 18.04 & 20.04:

sudo apt-get update -y && 
sudo apt-get upgrade -y && 
sudo apt-get dist-upgrade -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-10 g++-10 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 60 --slave /usr/bin/g++ g++ /usr/bin/g++-10 && 
sudo update-alternatives --config gcc

select gcc-10

GCC 10.1.0 on Ubuntu 16.04 & 18.04 & 20.04:

sudo apt-get update -y && 
sudo apt-get upgrade -y && 
sudo apt-get dist-upgrade -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-10 g++-10 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 60 --slave /usr/bin/g++ g++ /usr/bin/g++-10 && 
sudo update-alternatives --config gcc

select gcc-10

To ivanmara555's comment using the ppa repository...

As of today May 25th 2020 on Ubuntu 20.04 your list of commands does not install the latest 10.1.0. Instead, it installs the older "10.0.1 20200416 (experimental) (Ubuntu 10-20200416-0ubuntu1)" -- because the older version is the only one there at that PPA site for release "Focal". The other package "10.1.0-2ubuntu1~18.04" is for "Bionic" not "Focal".

On 20.04, run the following commands today (May 25th, 2020) and it shows that none of the packages are 10.1:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt update
sudo apt list -a gcc-10

If you can't find a PPA with "10.1.0", you'll have to build it from source. As a side note, the daily build of the next Ubuntu 20.10 does install 10.1.0.

Today's screenshot of repo https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test/+packages:

Thx

GCC 10.1.0 on Ubuntu 16.04 & 18.04 & 20.04:

sudo apt-get update -y && 
sudo apt-get upgrade -y && 
sudo apt-get dist-upgrade -y && 
sudo apt-get install build-essential software-properties-common -y && 
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && 
sudo apt-get update -y && 
sudo apt-get install gcc-10 g++-10 -y && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 60 --slave /usr/bin/g++ g++ /usr/bin/g++-10 && 
sudo update-alternatives --config gcc

select gcc-10

Doesn't seem to work for GCC 10 on 16.04:

$ sudo add-apt-repository ppa:ubuntu-toolchain-r/test
 Toolchain test builds; see https://wiki.ubuntu.com/ToolChain

 More info: https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test
Press [ENTER] to continue or ctrl-c to cancel adding it

gpg: keyring `/tmp/tmpnogzdmz6/secring.gpg' created
gpg: keyring `/tmp/tmpnogzdmz6/pubring.gpg' created
gpg: requesting key BA9EF27F from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpnogzdmz6/trustdb.gpg: trustdb created
gpg: key BA9EF27F: public key "Launchpad Toolchain builds" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
OK

$ sudo apt-get update
Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease
Hit:4 https://dl.winehq.org/wine-builds/ubuntu xenial InRelease
Hit:5 http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit:6 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial InRelease
Hit:7 https://download.sublimetext.com apt/stable/ InRelease
Reading package lists... Done

$ sudo apt-cache search ^gcc-[0-9]+$
gcc-5 - GNU C compiler
gcc-6 - GNU C compiler
gcc-7 - GNU C compiler
gcc-8 - GNU C compiler
gcc-9 - GNU C compiler

$ sudo apt-get install gcc-10 g++-10
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package gcc-10
E: Unable to locate package g++-10
E: Couldn't find any package by regex 'g++-10'

Yes, gcc-10 is not available on xenial, even in the toolchain repo (see the filter dropdown):

Thank you very much!

gcc-9[-multilib] and g++-9[-multilib] are also available for Ubuntu 12.04 LTS!

I extended the steps above, as they complain with g++ can't be slave of gcc + some additions and beautifications:

#!/bin/bash

GCC_GXX_VERSION=9
gcc_alternatives=(gcc cc)
gxx_alternatives=(g++ c++ cpp)
all_alternatives=("${gcc_alternatives[@]}" "${gxx_alternatives[@]}")

remove_alternatives() {
    alternatives=("$@")
    for alt in "${alternatives[@]}"; do
        sudo update-alternatives --remove-all $alt || continue
    done
}

install_and_set_alternatives() {
    path=$1
    shift
    alternatives=("$@")
    for alt in "${alternatives[@]}"; do
        sudo update-alternatives --install /usr/bin/$alt $alt $path 100
        sudo update-alternatives --set $alt $path
    done
}

print_green() {
    args=$@
    echo -e "\033[0;32m$args\033[0m"
}

check_versions() {
    alternatives=("$@")
    for alt in "${alternatives[@]}"; do
        print_green "$alt\t->\t`$alt --version | head -n 1`"
    done
}

install_gcc_gxx() {
    sudo apt-get update -y &&
    sudo apt-get upgrade -y &&
    sudo apt-get dist-upgrade -y &&
    sudo apt-get install build-essential software-properties-common -y &&
    sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y &&
    sudo apt-get update -y &&
    sudo apt-get install gcc-$GCC_GXX_VERSION g++-$GCC_GXX_VERSION -y
}

install_gcc_gxx
remove_alternatives "${all_alternatives[@]}"
install_and_set_alternatives "/usr/bin/gcc-$GCC_GXX_VERSION" "${gcc_alternatives[@]}"
install_and_set_alternatives "/usr/bin/g++-$GCC_GXX_VERSION" "${gxx_alternatives[@]}"

echo
echo "Check the following versions:"
check_versions "${all_alternatives[@]}"