This is probably a duplicate of bug #362315 or bug #428435
Could you please boot karmic live-CD and run on a terminal:
$ sudo blkid -p /dev/sdXN
where sdXN is your encrypted partition.
If karmic's blkid returns "Ambivalent result (probably more filesystems
on the device)" then this is a duplicate.
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Full disk encryption intrepid install fails to boot
https://bugs.launchpad.net/bugs/284904
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