Note that this dmesg output is with the booted 2.6.20-11 kernel. As for the log with 2.6.20-12 I cannot have it, it seems the error occurs before the disks are mounted.
** Attachment added: "Output of 'sudo dmesg'" http://librarian.launchpad.net/6874293/bug94083-dmesg.txt -- [Feisty] 2.6.20-12 does not boot https://launchpad.net/bugs/94083 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs