If you need to change the password, i.e., the encryption key, used to encrypt
a partition with
Linux Unified
Key Setup (LUKS) on a Linux system, you can open a terminal window and use
the command sudo cryptsetup luksChangeKey /dev/sdaX where
sdaX is the relevant partition. E.g., I needed to
change the password on a Ubuntu
Linux system where the user's data was stored on /dev/sda3.
jim@Firefly:~$ sudo cryptsetup luksChangeKey /dev/sda3 Enter passphrase to be changed: Enter new passphrase: Verify passphrase: jim@Firefly:~$
If you don't know the designation for the encrypted partition, e.g., if I
didn't know it was sda3, I could use the lsblk
command (it is part of the
util-linux package) to determine it. E.g.:
jim@Firefly:~$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS loop0 7:0 0 4K 1 loop /snap/bare/5 loop1 7:1 0 73.9M 1 loop /snap/core22/2133 loop2 7:2 0 11.8M 1 loop /snap/desktop-security-center/59 loop3 7:3 0 247.6M 1 loop /snap/firefox/6966 loop4 7:4 0 11.1M 1 loop /snap/firmware-updater/167 loop5 7:5 0 91.7M 1 loop /snap/gtk-common-themes/1535 loop6 7:6 0 14.4M 1 loop /snap/prompting-client/104 loop7 7:7 0 516.2M 1 loop /snap/gnome-42-2204/226 loop8 7:8 0 17.5M 1 loop /snap/snap-store/1300 loop9 7:9 0 50.8M 1 loop /snap/snapd/25202 loop10 7:10 0 576K 1 loop /snap/snapd-desktop-integration/315 loop11 7:11 0 226.2M 1 loop /snap/thunderbird/812 sda 8:0 0 953.9G 0 disk ├─sda1 8:1 0 1G 0 part /boot/efi ├─sda2 8:2 0 2G 0 part /boot └─sda3 8:3 0 950.8G 0 part └─dm_crypt-0 252:0 0 950.8G 0 crypt └─ubuntu--vg-ubuntu--lv 252:1 0 950.8G 0 lvm / jim@Firefly:~$
From the above output, I can see that the disk drive in the system is
designated as sda and the encrypted partition is
sda3 (it is listed as type "crypt").
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