`cryptsetup open` fails with correct passphrase - "No key available with this passphrase."

Question

I recently ran (essentially) rm -rf / --no-preserve-root on my LUKS encrypted BTRFS root filesystem. I'm trying to mount the drive from an endeavouros (arch) liveusb, without success.

I created a directory to mount in /home/liveuser/m, and am trying to open /dev/nvme1n1p2 with the following command: sudo cryptsetup open /dev/nvme1n1p2 followed by entering my passphrase. I have looked through many answers through SO, superuser, and Unix/Linux, but they all seem to be incorrect passphrases or hardware incompatibility; which is extremely unlikely because I am using the same hardware, the only difference being the liveusb. I highly doubt I am entering an incorrect passphrase for the following reasons:

my keyboard is, and always has been en_US qwerty

when I try to boot from the disk normally, grub(?) asks me for the passphrase and accepts it, outputting the following:

Attempting to decrypt master key...
Slot 0 opened
error: file `/@/boot/grub/x86_64-efi/normal.mod' not found.
Entering rescue mode...

any help is much appreciated!

Answer 1

I think you may be using an incorrect/incomplete command to open the volume. Try this -

  sudo cryptsetup luksOpen /dev/nvme1n1p2 decryptedblock
  sudo mount /dev/mapper/decryptedblock /mnt

(Change the mount point on the second command as appropriate). I've now played around with it, and you could possibly replace the first command with cryptsetup open --type luks /dev/nvme1n1p2 decryptedblock )

When you are finished, you can do

 sudo umount /mnt
 sudo luksClose decryptedblock