*** This bug is a duplicate of bug 1896380 ***
https://bugs.launchpad.net/bugs/1896380
You still have packages from oibaf PPA installed and they are
interfering with the upgrade. I see in your other bug report, you had an
issue with ppa-purge. You have to solve that first.
** This bug has been marked a duplicate of bug 1896380
An unresolvable problem occurred while calculating the upgrade. 18.04 to
20.04
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https://bugs.launchpad.net/bugs/1896386
Title:
An unresolvable problem occurred while calculating the upgrade. 18.04
to 20.04
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