I installed 21.10(impish), I found this issue is gone, there are no error
messages.
mdadm 4.2~rc2-2ubuntu1
finalrd 8
systemd 248.3-1ubuntu8
** Also affects: mdadm
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1940514
Title:
It will prompt "Failed to unmount /oldroot" when shutdown or reboot
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