I had the same issue and I had to boot from a CD, mount the filesystem and edit the fstab and comment out the usb entry. After that I was able to boot.
-- Lucid alpha 2 fails to start up unless you remove /proc/bus/usb from the fstab https://bugs.launchpad.net/bugs/507881 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs