I believe I found the problem. The "magic" groot option in /boot/grub/menu.lst was setting root to the wrong volume, which worked for awhile because I had a recent installation in that volume.
-- "Error 15: File not found" after update to kernel 2.6.22-12 https://bugs.launchpad.net/bugs/144121 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
