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Question Upgrade stuck from 18.04 to 20.04


Feb 24, 2020
Yea. I was surprised too but 20.04 not detected the existing system. But the filesystem, EFI partition also healty, so this is strange. 18.04 instantly detected it. I'm doing the backup atm and I see that also some configuration files are missing too. Not a big deal but after 15 years of Ubuntu usage it's new behaviour to me.


Trusted User
Founding Member
Nov 23, 2018
Well, I discovered the culprit. Ubuntu changed how they package Python in 20.04, but if you had orphans laying around that still needed old Python packages, Python would refuse to upgrade. So to avoid this in future, it's best to use Flatpak for Python software.

If someone is reading this now contemplating the 18.04 to 20.04 upgrade, and you've been using apps that use Python, it may help to purge all PPAs and run deborphan. You would have to install deborphan, and be mindful that it might remove something you're actively working on, so back ups are a must. Purging PPAs can be done with ppa-purge.

To clarify, normally the installer attempts to delete all ppas, disable extensions and run apt update && apt full-upgrade before entering the upgrade proper. Sometimes PPAs get in the way or the package manager is borked, but the commands to fix the package manager usually work nicely - unless there are python package orphans in your 18.04. This apparently will break the upgrade because Ubuntu changed the way it packages Python for 20.04.
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