I got the same error using a bare metal system on 16.04.. That system got updated from 14.04 (and is much older). That system got installed completely separate/independent, so there is not much to consider that both systems somehow seem to be similar in terms of configuration.
The kernel of this system is 4.4.0-57-generic, whereas the error happened after a kernel update followed by a reboot. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1651435 Title: BTRFS error: could not find root 8 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1651435/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs