It is not enough to just turn off sources for third party packages, you
actually need to revert back to the official versions of the package
from the Ubuntu archive. This can be done with the tool 'ppa-purge' and
you'll need to at least do it for the kisak mesa packages you have
installed.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1891035
Title:
I am unable to update my Ubuntu from 18.04 to 20.4 despite all efforts
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