The issue was with broken xserver-xorg-video* packages. Removed all of
these and the upgrade proceeded.
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https://bugs.launchpad.net/bugs/1800741
Title:
Unspecified error calculating
Thank you for taking the time to report this bug and helping to make
Ubuntu better. The error that you are a reporting is a conflict between
packages from the official Ubuntu archive and packages from a PPA. To
resolve this situation please deactivate PPAs using the tool 'ppa-purge'
which is
** Tags added: bionic2cosmic
** Tags added: third-party-packages
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https://bugs.launchpad.net/bugs/1800741
Title:
Unspecified error calculating changes for upgrade
To manage