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

[Bin Li]

** Also affects: mdadm
   Importance: Undecided
       Status: New

** Also affects: finalrd
   Importance: Undecided
       Status: New

** Also affects: oem-priority
   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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