Guide: migrate from old Ubuntu LTS to new Ubuntu LTS

ubuntu-lts-migration.md

Migration steps

1. Upgrade installed packages: sudo apt update && sudo apt upgrade
2. Remove all packages installed with checkinstall
   • You can search with Synaptic using 'checkinstall' query
3. Remove all ppa repositories (see "How to remove PPAs " below)
4. Run Update Manager and upgrade distribution: sudo update-manager -d
5. After upgrade, use lsb_release -a to see Ubuntu version

How to remove PPAs

Install ppa-purge: `sudo apt install ppa-purge

Then run the following script to autodetect PPAs and format ppa-purge commands:

#! /bin/sh 
# listppa Script to get all the PPA installed on a system ready to share for reininstall
for APT in `find /etc/apt/ -name \*.list`; do
    grep -o "^deb http://ppa.launchpad.net/[a-z0-9\-]\+/[a-z0-9\-]\+" $APT | while read ENTRY ; do
        USER=`echo $ENTRY | cut -d/ -f4`
        PPA=`echo $ENTRY | cut -d/ -f5`
        echo sudo ppa-purge ppa:$USER/$PPA
    done
done

You can copy-paste the script above using nano editor: nano listppa.sh. Then use chmod +x listppa.sh to make script file executable, and run ./listppa.sh (without root privilegies)

Script will output PPA list with removal commands, e.g.:

sudo ppa-purge ppa:ubuntu-desktop/ubuntu-make
sudo ppa-purge ppa:ubuntu-sdk-team/ppa
sudo ppa-purge ppa:webupd8team/atom
sudo ppa-purge ppa:thomas-schiex/blender
sudo ppa-purge ppa:lyzardking/ubuntu-make
sudo ppa-purge ppa:zeal-developers/ppa
sudo ppa-purge ppa:ubuntu-toolchain-r/test
sudo ppa-purge ppa:cginternals/ppa
sudo ppa-purge ppa:ubuntu-desktop/ppa
sudo ppa-purge ppa:adrozdoff/cmake
sudo ppa-purge ppa:jonathonf/rustlang

Then copy-paste commands and run them in terminal (either one by one or all together).