I would recommend you to move the whole disk to another known working machine when this happens again to make sure this is not a hardware issue.
As for /var directory you saved, root is root universally. You should be able to examine its content in some live CD session or so. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1849419 Title: kernel panic after upgrading from 19.04 to 19.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1849419/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs