[Bug 1955690] [NEW] Prompt error message "Failed to unmount /oldroot" when shutdown or reboot

[Bin Li]

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

Status in finalrd:
  New
Status in mdadm:
  New
Status in OEM Priority Project:
  New
Status in mdadm package in Ubuntu:
  New

Bug description:
  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.

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