The upgrade to Ubuntu 20.04 is failing to calculate because you have
installed graphics driver packages from the kisak-ubuntu-kisak-mesa PPA.
Please remove that PPA using the tool ppa-purge. It will also install
the official Ubuntu versions of the same packages and after that try the
upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1897591
Title:
upgrade 20.04 crashes
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