Hi, sorry for not coming back earlier.

I sadly can't reproduce this issue with grml-medium_sid_20110509.iso, so we 
need either further information or have to close the bugreport because it's 
unreproducable.

I'm wondering about the:

| Device grml-crypt_Sources.img is busy.

and

| Device grml-crypt_Sources.img already exists.

Given it's using /dev/loop0 on your system, are you using a grml2hd 
installation? What cryptsetup version are you using?

thx && regards,
-mika-