PPA's are causing the problem.
Try this:
sudo apt-get install ppa-purge
sudp ppa-purge ppa:lutris-team/lutris
sudo ppa-purge ppa:kisak/kisak-mesa
Let us know how it works.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1909620
Title:
can't upgrade to 20.04
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