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

[Bin Li]

*** This bug is a duplicate of bug 1940514 ***
    https://bugs.launchpad.net/bugs/1940514

A solution from Daniel.

https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1928200/comments/11

** This bug has been marked a duplicate of bug 1940514
   It will prompt "Failed to unmount /oldroot" when shutdown or reboot

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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 couldn't umount /oldroot, cause
  it's used by plymouth.

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