This also affected a 9.10 -> 10.04 Desktop, not Server, machine that had
removed the `splash' from the kernel line some time earlier. The non-
free virtualbox had placed the line
none /proc/bus/usb usbfs devgid=127,devmode=664 0 0
at the end of /etc/fstab some months earlier. Its presence caused the
10.04 boot to hang with no prompting, and various unrelated lines of
output since mountall started meant the cause wasn't clear.
Google shows this is biting quite a few people, e.g.
http://ubuntugenius.wordpress.com/2010/05/07/fix-an-error-occurred-
while-mounting-procbususb-bootup-error-after-upgrade-to-lucid/ I think
medium is too low a priority for something that stops the system from
booting unless you accidentally press `s' when prodding the keyboard for
a response, e.g. a friend typed `ls<Return>' on his machine on one of
the failures and was puzzled that Return made it continue that time but
never again.
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Boot hangs and unable to continue when automount disk in fstab is not available
(Off or Disconnected)
https://bugs.launchpad.net/bugs/571444
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