I added the PPA packages back in, reinstalled the related software, and removed them with ppa-purge. Followed that with apt update, autoremove and a necessary reboot. After all that, I got the same "unresolvable problem" error when I tried to do-release-upgrade.
I added the PPA packages back in, reinstalled the related software, and removed them with ppa-purge. Followed that with apt update, autoremove and a necessary reboot. After all that, I got the same "unresolvable problem" error when I tried to do-release-upgrade.