It is not enough to disable the third party PPAs as you've done, rather
you need to use the tool ppa-purge to disable those PPAs and install the
official versions of the packages the PPA provides. So please re-enable
the mesa PPA and then use ppa-purge to switch to the official Ubuntu
packages and try the upgrade again. Thanks and good luck!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1897993
Title:
Upgrade from v18 LTS to 20.04.1 LTS doesn't work both via shell and
using upgrade manager
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