I had the same issue. Thanks for this workaround!
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No usb disks at all mount [gutsy]
https://bugs.launchpad.net/bugs/130490
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Public bug reported:
After I installed upstart, I can't enter my cryptofs-password at boot
time. I get the following error:
cryptofs: Command failed: Key reading error.
After boot, I can restart /etc/init.d/cryptdisks, enter my password and
mount /dev/mapper/crypt. This is no problem.
** Affect