SOLVED: HOWTO mount an external, encrypted LUKS volume under Linux

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My daughter recently dropped my computer flat on the floor from a standing height (she’s only 5), catastrophically crashing both hard drives in the laptop. I limped along for a few days because I had to function with it for work, and only just today, decided to rip it apart, back up the data that could be read, put in two new 500GB/7200 drives and reinstall everything from scratch.

The painful part, was that my original configuration was a dm-crypted LUKS volume inside an encrypted LVM container, and mounting the volume without booting to it, is not straightforward.

The first piece was to back up the data on it, as best as I could. That was a bit trickier than I’d originally assumed, because I had to be sure I wasn’t going to “fix” the area of the drive that contained the encryption key that unlocked the encrypted LVM container.

After booting in single-user mode and putting in my passphrase to unlock the volume, I ran:

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