I installed Ubuntu 12 with full disk encryption, and now I want to change the pass phrase.
How can this be done?
This is the easiest way to do it:
Ubuntu uses LUKS to encrypt partitions and LVMs.
LUKS supports eight key slots per partition. The
Basically the right way to do this is you want to add a key to a new slot, test that you can successfully use the new key, and then when you are ready, delete the old key.
During the boot process, when you are asked for the key, it should tell which block device it's trying to unlock. That's the partition you need to apply the
I would back up your data before trying this or taking anyone else's advice, or at least wait for a couple upvotes. It's been a while since I changed a key on a LUKS partition. (edit: or used a Linux system with GUI...)
Here is what to do
Now look to the right. There are likely to be several partitions.
The option to change passphrase will be available if its the right partition.