Comment 15 for bug 325690

Ok, I can confirm the behavior reported by the latest follow-ups. Rebooting after upgrade, the system hangs while starting udev and never advances. Downgrading to udev 1.37-2 and dmsetup 2:1.02.27-4ubuntu3 corrects this problem (while using an older initramfs that doesn't contain udev 1.38).

If this is specific to systems using devmapper for / then I suppose it makes sense to continue using this same bug for tracking the issue.