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LUKS
Decrypt the LUKS partition and reveal the underlying virtual device(s):
cryptsetup luksOpen /dev/[PARTITION] [VIRTUAL_PARTITION_NAME]
Remove the virtual device(s):
cryptsetup luksClose [VIRTUAL_PARTITION_NAME]
Info
The VIRTUAL_PARTITION_NAME
can be whatever name you want to use for the virtual device associated with the decrypted partition.
Change the LUKS encryption passphrase:
cryptsetup luksChangeKey /dev/[PARTITION]