[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:lp-2045586-jammy into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Michael Hudson-Doyle has proposed merging ~mwhudson/livecd-rootfs/+git/livecd-rootfs:lp-2045586-jammy into livecd-rootfs:ubuntu/master.

Commit message:
Use flock to avoid races with systemd-udevd that cause loop device partitions to briefly disappear. (LP: #2045586)


Requested reviews:
  Canonical Foundations Team (canonical-foundations)
Related bugs:
  Bug #2045586 in util-linux (Ubuntu): "livecd-rootfs uses losetup -P for theoretically reliable/synchronous partition setup but it's not reliable"
  https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/2045586
  Bug #2049723 in livecd-rootfs (Ubuntu): "ubuntu-server ftbfs in jammy with livecd-rootfs 2.765.34"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/2049723

For more details, see:
https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/460729
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