Triaged this bug and consolidated five other reports as duplicates: bug
#2095232, bug #2116208, bug #2142961, bug #2143656, bug #2143782, and
bug #2139330. The bug report spans three different upgrade paths (20.04
to 22.04, 22.04 to 24.04, 23.04 to 24.04)

The common underlying behavior, visible in the debug log of duplicate
bug #2095232 comment #0, is: the upgrader fails to mark ubuntu-desktop
(or another desktop meta-package) for upgrade because of held broken
packages, then tries to remove update-manager as part of conflict
resolution, and hits the denylist regex update-manager$ in
/usr/share/ubuntu-release-upgrader/removal_denylist.cfg, which causes a
hard upgrader failure with a misleading error message.

The probable trigger differs across reporters but the upgrader code path
that converts a recoverable held-package conflict into an unrecoverable
denylist failure is the same in all six.

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https://bugs.launchpad.net/bugs/2084610

Title:
  Update marks update-manager for removal causing to abort

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