Facing this as well. Upgrade from 20.04 to 21.04 went OK (minor issue
with `openmpi-bin`). Currently upgrading from 21.04 to 21.10 and have
been waiting on "Searching for obsolete software" for almost an hour now
(still at 64%).

i5-3570K, 24GB of RAM, one core always at 100% usage. `/var/log/dist-
upgrade/apt.log` shows lots of `pkgProblemResolver` going on.

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https://bugs.launchpad.net/bugs/1874272

Title:
  Stage "searching for obsolete software" takes a very long time (30
  minutes)

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