I think this can be marked as duplicate of bug #428435. I know this bug
dates back a lot more and it's not originally util-linux-ng related, but
on karmic this will manifest through blkid.

However the underline cause of these bug reports is the fact that older
versions of cryptsetup (<1.0.7) did not clear the partition superblock
and thus left bogus signatures floating around. It was a bug with
cryptsetup and that bug has now been fixed upstream and from karmic
onward people should not be affected with new partitions.

It's unfortunate that the bug is causing a lot of trouble to some users,
I included, but let's face it; there's no way we can sanely come up with
patches to vol_id or blkid which would automatically guess which
signature is the right one. Therefore this is  a WONTFIX for every
package affected. It's true that old vol_id did claim a partition as
LUKS encrypted even though there were other signatures also. This was
"wrong" behaviour, but it just happened to work.

I will try to create an encrypted partition with both LUKS and swap
signatures under jaunty and then try to add support to my script in bug
#428435 (comment 24) to remove the swap signature so that there's at
least some way for people to migrate from jaunty to karmic without
having to reformat their LUKS partitions.

-- 
blkid fails to identify old LUKS partition volumes
https://bugs.launchpad.net/bugs/362315
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