You have oibaf PPA still enabled. Please follow the directions and run
ppa-purge on it (and other PPA's you may have enabled) to restore stock
18.04 packages. Then, try to upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1901098
Title:
fauled Ubuntu upgrade from 18 to 20
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