[http://whatislinux.net/tag/ubuntu]
Load the LVM module - modprobe dm-mod. You can skip this step in Jaunty (9.04) 
because the dm-mod module is compiled into the kernel.

I were mistakenly trying

ubu...@ubuntu:~$ cryptsetup  luksOpen /dev/sdaX pvcrypt04X
mlockall failed: Cannot allocate memory
WARNING!!! Possibly insecure memory. Are you root?
Command failed: Cannot communicate with device-mapper. Is the dm_mod module 
loaded?

ubu...@ubuntu:~$ sudo cryptsetup  luksOpen /dev/sda8 pvcrypt04
Enter LUKS passphrase: 
key slot 0 unlocked.
Command successful.

Only I was forgetting sudo

Please do check if this was the problem.

-- 
No dm-mod module after lvm2 installed
https://bugs.launchpad.net/bugs/343147
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