Comment 22 for bug 2045586

While the above MP is now merged, I still see additional potential races in the code. For example, anything calling mount_partition() for the first partition, and also maybe bug 2030771. I don't see a good way to solve that w/o `udevadm lock` because these functions don't currently know what the full block device - and I don't think we want to implement that logic ourselves.

I suggest we move from flock to `udevadm lock` once it is available in noble. If that proves to be stable, then perhaps we consider backporting that to jammy's systemd.