There were two issues:
(1) mesa in focal has lower version than in releases, newer one stuck in
proposed
(2) ubuntu-release-upgrader did not check that the solution it picked at
the end (after re-marking meta packages for upgrades) was actually
valid. It assumed that if mark_upgrade() failed, the operation was a no-
change, when it actually led to broken packages.
(2) is fixed, (1) should be fixed soon.
** Also affects: mesa (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mesa (Ubuntu)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1861756
Title:
upgrade from 18.04 to 20.04 issues due to colord / libsane issue
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