I've just checked on my recently-built Karmic laptop to see if this is still a problem. I think it is not. The /etc/crypttab generated automatically as part of the Karmic installation contains an _ in the device name, so I suspect this was probably fixed by a new release of whatever package reads that file.
I've just checked on my recently-built Karmic laptop to see if this is still a problem. I think it is not. The /etc/crypttab generated automatically as part of the Karmic installation contains an _ in the device name, so I suspect this was probably fixed by a new release of whatever package reads that file.
I suggest closing this bug.