Linux Mint: How to change encryption password and options

In this short guide, I'll show you how to change the encryption passphrase by using Linux Mint GUI. This change is tested with Linux Mint Cinnamon 19.1 and 19.3.

Step 1: Open Disks

To start, let's say that you have the several disks/drives and you need to find which one contains the encryption/LUKS. You can do it by application disks - which is very useful when you are working with disks in Linux Mint and Ubuntu. It can be open by:

  1. Menu
  2. Preferences
  3. Disks - or just by searching for disks in the menu

The documentation for this program can be found on this links:

It looks like:

python_online_editor_2020

Step 2: Find the correct drive, partition

Based on the above display, you can find the drive which contains the encryption and locate the correct: disk/device/drive/volume/LUKS partition.

On the left you can see devices and disks. You need to select the correct one - in my case is 512 GB Disk.

Then you need to select on the right the correct volume/file system/partition which contains the LUKS. In my case it's Partition 3 511 GB LUKS.

When you select the correct partition which is encrypted with password you will see something like:

Contents: LUKS encryption (version 1) - Unlocked

Step 3: Change the Passphrase

In this step we assume that correct volume is selected in the previous step. In this case you can change the encryption pass by:

  • Additional Partition Options - Click the gear wheel (cogs) below the volumes
  • Change Passphrase...

linux_mint_change_encryption_password_dialog

Step 4: Change the Encryption Options(optional)

If you like to change the encryption options than you can continue step 3 with:

  • Additional Partition Options
  • Edit Encryption Options...

linux_mint_change_encryption_options

Now you can change whether the system to be unlocked at system startup or to add additional authorization. The encryption volume can be changed as well.

Note: It's important to have up to date backup when you change the encryption options in case that something went wrong. In my case the changes didn't result in problems. But I had experience with corrupted hard disk which resulted in problems to access the Linux Mint data. The only solution in this case was backup.

Note 2: In my case I wanted to share computer with full encryption to other person. Since the password is important for me and I didn't like the idea to share it with someone else - so I change the passphrase for the full encryption on my Linux Mint and after when I got the machine back - I restore it.

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