your trace indicates that the postinst script is caught in an endless loop. It seems that you have a line in your /etc/crypttab that reads like this:
luks,retry=1,cipher=aes-lrw-benbi # ab Kernel 2.6.20 (gutsy, feisty): cipher=aes-lrw-benbi
IOW: a line that contains a comment. This is not supported by the postinst script, please insert a newline before the hashmark, or remove that comment.
Ha, that's interesting.
your trace indicates that the postinst script is caught in an endless loop. It seems that you have a line in your /etc/crypttab that reads like this:
luks,retry= 1,cipher= aes-lrw- benbi # ab Kernel 2.6.20 (gutsy, feisty): cipher= aes-lrw- benbi
IOW: a line that contains a comment. This is not supported by the postinst script, please insert a newline before the hashmark, or remove that comment.