[Bug 2030771] [NEW] e2fsck fails because device is "in use"

[Gauthier Jolly]

Public bug reported:

CPC sees recurrent build failures across multiple series when process
reaches the function "umount_partition". This is due to e2fsck failing
with the following error:

+ e2fsck -y -E discard /dev/mapper/loop3p1
e2fsck 1.45.5 (07-Jan-2020)
/dev/mapper/loop3p1 is in use.
e2fsck: Cannot continue, aborting.

However, at this point the partition is not mounted anymore nor used by
any process inside the LXD container.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2030771

Title:
  e2fsck fails because device is "in use"

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  CPC sees recurrent build failures across multiple series when process
  reaches the function "umount_partition". This is due to e2fsck failing
  with the following error:

  + e2fsck -y -E discard /dev/mapper/loop3p1
  e2fsck 1.45.5 (07-Jan-2020)
  /dev/mapper/loop3p1 is in use.
  e2fsck: Cannot continue, aborting.

  However, at this point the partition is not mounted anymore nor used
  by any process inside the LXD container.

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