** Description changed:

  We were seeing the same sequence of errors heppened on KVM and ARM
  device running UC20:
  
  """
  [12450.684692] sd-umoun[5922]: Failed to unmount /oldroot: Device or resource 
busy
  [12450.693515] sd-remou[5923]: Failed to remount '/oldroot/run/mnt/data' 
read-only: Device or resource busy
  [12450.704374] sd-umoun[5924]: Failed to unmount /oldroot/run/mnt/data: 
Device or resource busy
  [12450.714225] sd-umoun[5925]: Failed to unmount /oldroot/run: Device or 
resource busy
  [12450.726073] shutdown[1]: Could not detach loopback /dev/loop0: Device or 
resource busy
  [12450.735481] shutdown[1]: Failed to finalize file systems, loop devices, 
ignoring
  [12451.129165] reboot: Power down
  """
  
  [Steps to reproduce]
  
  $ sudo poweroff or $ sudo reboot
- 
- There are few issues may be relevant but the PR listed on below was not
- useful for this case.
- 
- https://github.com/systemd/systemd/issues/14298
- https://github.com/systemd/systemd/issues/14981
- https://github.com/systemd/systemd/pull/15566

** Description changed:

  We were seeing the same sequence of errors heppened on KVM and ARM
  device running UC20:
  
  """
  [12450.684692] sd-umoun[5922]: Failed to unmount /oldroot: Device or resource 
busy
  [12450.693515] sd-remou[5923]: Failed to remount '/oldroot/run/mnt/data' 
read-only: Device or resource busy
  [12450.704374] sd-umoun[5924]: Failed to unmount /oldroot/run/mnt/data: 
Device or resource busy
  [12450.714225] sd-umoun[5925]: Failed to unmount /oldroot/run: Device or 
resource busy
  [12450.726073] shutdown[1]: Could not detach loopback /dev/loop0: Device or 
resource busy
  [12450.735481] shutdown[1]: Failed to finalize file systems, loop devices, 
ignoring
  [12451.129165] reboot: Power down
  """
  
  [Steps to reproduce]
  
  $ sudo poweroff or $ sudo reboot
+ 
+ [Additional info]
+ 
+ http://cdimage.ubuntu.com/ubuntu-core/20/stable/current/ubuntu-
+ core-20-amd64.img.xz

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https://bugs.launchpad.net/bugs/1920107

Title:
  Failed messages of sd-umount shown with reboot/shutdown

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