Public bug reported:

After I installed the mdadm, it will show this error information, our
OEM vendor request to fix this issue.

The root cause is that mdadm depend on finalrd, and finalrd will switch
rootfs to clean disk, but it cou.dn't umount /oldroot, cause it's used
by plymouth.

** Affects: finalrd
     Importance: Undecided
         Status: New

** Affects: mdadm
     Importance: Undecided
         Status: New

** Affects: oem-priority
     Importance: Undecided
         Status: New

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

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https://bugs.launchpad.net/bugs/1955690

Title:
  Prompt error message "Failed to unmount /oldroot" when shutdown or
  reboot

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