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.
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 `pkgProblemReso lver` going on.