You still have packages from the oibaf PPA (and maybe some other PPA's)
installed. You need to run 'ppa-purge' on those PPA's before upgrading.
After you do that, try again and let us know if the upgrade still fails.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1909601
Title:
Cannot upgrade to 20.04 for no apparent reason
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