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I've got SIFT (based on Ubuntu 9.10) installed on a work laptop. We're trying to encrypt the entire installation (root partition and swap), which is apparently doable using LUKS, but I'm having some trouble getting it all to work.

Here's where I'm at so far:

I have an unencrypted /boot partition, one unencrypted root partition, and one encrypted partition. The encrypted partition contains an exact copy of everything in the unencrypted partition. I want to switch from booting into the unencrypted partition to booting into the encrypted one.

I've added a '/dev/mapper/root' to /etc/fstab and a corresponding entry in /etc/crypttab. I also added a new menu item in GRUB which should point to the encrypted partition. When I select that menu item, I get an error saying that /dev/mapper/root doesn't exist.

I'm guessing there's something I'm missing here. Can anyone help?

(Oh, and the SIFT install ISO doesn't include the alternate installer, so I can't do a guided encrypted setup.)

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