Encrypt Disk
Change Hard Disk Password
Ubuntu 20.04
gnome-disks
Click on the LUKs partition

Click on the two cogs>Change Passphrase.

Change Passphrase

Related
Links
- https://en.wikipedia.org/wiki/Linux_Unified_Key_Setup
gnome-disks
Click on the LUKs partition
Click on the two cogs>Change Passphrase.
Change Passphrase