I too confirm this bug for dmraid on Feisty Herd 5 (amd64). When booting from the HDD the only message I receive to the console is "no block devices found". (I believe this message is issued by dmraid.) The workaround suggested by Quikee solves the problem.
I used the update-manager to upgrade from Edgy. Note: Edgy didn't exhibit this problem. -- linux software RAID not working after herd 3 installation.. https://launchpad.net/bugs/83231 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs