I found a couple of crash reports (bug 1767747) in Launchpad regarding lvm2 and the crash happening on reboot after upgrading to 18.04, although its possible they only received the notification after rebooting. Do you happen to know whether the lvm2 crash occurred after reboot or during the upgrade?
There is also this bucket, which is private, in the Ubuntu Error Tracker but that stacktrace (while incomplete) looks rather different. https://errors.ubuntu.com/problem/c53304c6d22dcaad9f9b61ac48cc8e1cfa66ef17 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1789977 Title: Upgrade from 16.04 to 18.04 crashed, required dpkg --configure -a to recover (multiple machines) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1789977/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
