Installing gcc-7 & g++-7 in Ubuntu 16.04LTS Xenial

Install_gcc7_ubuntu_16.04.md

Run the following in the terminal:

Install the gcc-7 packages:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt update
sudo apt install g++-7 -y

Set it up so the symbolic links gcc, g++ point to the newer version:

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
gcc --version
g++ --version