Ubuntu upgrade to 20.04 LTS from 18.04 LTS partially broken and system freezes randomly

[coolcatco888]

Please see details in this post:
https://askubuntu.com/questions/1289999/ubuntu-20-04-freezes-during-gaming-also-some-packages-cant-upgrade

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.28
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.11
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: GNOME-Flashback:GNOME
Date: Thu Nov 5 18:55:57 2020
InstallationDate: Installed on 2011-01-09 (3588 days ago)
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeTermlog:

[coolcatco888 (coolcatco888)]

Also the partial upgrader now seems to crash on calculating changes.

[kisak (kisak)]

Hello, as you've already figured out, mesa didn't get upgraded along with the rest of the dist-upgrade because it's newer than what is provided in the main repositories. As noted in my PPA, it's strongly recommends you ppa-purge kisak-mesa before doing distro upgrades. You might get lucky by re-adding the PPA:

sudo add-apt-repository ppa:kisak/kisak-mesa
sudo apt upgrade

If that doesn't help, then ppa-purge it:

sudo apt install ppa-purge
sudo ppa-purge ppa:kisak/kisak-mesa

and reassess the situation.

[coolcatco888 (coolcatco888)]

Wow, thank you so much!

This definitely fixed it:
sudo add-apt-repository ppa:kisak/kisak-mesa
sudo apt upgrade

No problems reported anymore, everything is clean.

Thanks again!