@daniel, I reported a new issue. Let's focus on below links. Thanks!
https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1955690 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1928200 Title: Prompt error message "Failed to unmount /oldroot" when shutdown or reboot Status in OEM Priority Project: Fix Released Status in systemd package in Ubuntu: Fix Released Status in systemd source package in Focal: Fix Released Bug description: [impact] root fs is not cleanly unmounted on shutdown [test case] create a file in /etc/binfmt.d/TestFormat.conf with the following content: :TestFormat:M::XX::/bin/true:F reboot the system, and then shutdown or reboot again, and watch the serial console for the error message: sd-umount[1334]: Failed to unmount /oldroot: Device or resource busy [regression potential] any regression would likely cause problems on shutdown and/or reboot, or may cause problems with unmounted root fs on shutdown/reboot [scope] this is needed only for f this is fixed upstream with PR 15566 which is included in v246, so this is fixed already in g and later this isn't reproducable on b [original description] On ubuntu 20.04, with latest kernel and systemd, it will show error on ThinkPad X1. sd-umount[1334]: Failed to unmount /oldroot: Device or resource busy systemd 245.4-4ubuntu3.6 kernel: 5.8.0-53 To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1928200/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
