When I removed 'splash' parameter from grub, I couldn't find this error any more, is it possible the 'splash' used the /oldroot/dev/pts ? Thanks!
** Tags added: originate-from-1940796 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1940514 Title: It will prompt "Failed to unmount /oldroot" when shutdown or reboot To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1940514/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
