I was reading similar bug reports, and it seems to be that the LVM partitions don't trigger a vgscan, so it might be rather a runtime than an initrd creation problem.
** Package changed: initramfs-tools (Ubuntu) => udev (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/596554 Title: Unable to mount root LVM partition To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/udev/+bug/596554/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs