[Bug 1920107] [NEW] Failed messages of sd-umoun show with reboot/shutdown

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We were seeing the same sequence of errors heppened on KVM and ARM
device running UC20:

"""
[12450.684692] sd-umoun[5922]: Failed to unmount /oldroot: Device or resource busy
[12450.693515] sd-remou[5923]: Failed to remount '/oldroot/run/mnt/data' read-only: Device or resource busy
[12450.704374] sd-umoun[5924]: Failed to unmount /oldroot/run/mnt/data: Device or resource busy
[12450.714225] sd-umoun[5925]: Failed to unmount /oldroot/run: Device or resource busy
[12450.726073] shutdown[1]: Could not detach loopback /dev/loop0: Device or resource busy
[12450.735481] shutdown[1]: Failed to finalize file systems, loop devices, ignoring
[12451.129165] reboot: Power down
"""

[Steps to reproduce]

$ sudo poweroff or $ sudo reboot

There are few issues may be relevant but the PR listed on below was not
useful for this case.

https://github.com/systemd/systemd/issues/14298
https://github.com/systemd/systemd/issues/14981
https://github.com/systemd/systemd/pull/15566

** Affects: snapd
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: rls-ff-incoming
-- 
Failed messages of sd-umoun show with reboot/shutdown
https://bugs.launchpad.net/bugs/1920107
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