losetup does not decrypt device in Ubuntu 11.4 as before

Posted by Kay on Super User See other posts from Super User or by Kay
Published on 2011-04-16T14:20:07Z Indexed on 2014/05/27 15:34 UTC
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disk-encryption

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ubuntu-11.04

I had an external volume mounted using losetup for about two years. It was created using Ubuntu 9.4 and I used the same Ubuntu installation throughout all dist upgrades. Now as I bought a new laptop I set up a fresh Ubuntu 11.4 installation on it.

Problem is: losetup -e twofish /dev/loop0 /dev/sdb2 does not decrypt the volume anymore. The data in /dev/loop0 contains apparently random data. I am sure I entered the correct password.

I modprobe'd cryptoloop and twofish.

My question is: Has Canonical done some obscure changes to losetup like adding a salt? Does losetup depend on configuration files I did not know about? How can I decrypt the volume on my now laptop?

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