Comment 18 for bug 2045586

I updated my livecd-rootfs PPA test package that runs this section of code in a loop to use this pattern, and it survived until the autopkgtest timeout - 304 iterations:

https://autopkgtest.ubuntu.com/results/autopkgtest-noble-dannf-loop/noble/amd64/l/livecd-rootfs/20240128_061640_5c909@/log.gz

...when it previously was failing reliably within a few iterations.

They `udevadm lock` fix is now in unstable, so the next sync should pull it in.

However, I don't know that we really need any features of `udevadm lock` beyond the actual flock'ing of the device. We could presumably do that with `flock` for older releases. Or we could consider SRU'ing back the udevadm lock command to jammy as a low priority SRU. The way it was introduced looks very non-invasive:
  https://github.com/systemd/systemd/commit/8b12a516e9304f720e07eeec5d25c5b7f7104bc9
But I haven't gone through the bug fixes since to ensure it remained that way.