Encryption in Ubuntu

Folder encryption

Encfs tool and automatic mounting with gnome-encfs.

Home folder encryption

During Ubuntu installation you can check Home encryption checkbox and fill the passphrase.

Whole disk encryption

The simpliest way is to use the Alternate Installer (special Ubuntu installation image, for example Ubuntu GNOME Remix) with LVM.

Password management in LVM

Typically your "virtual" LVM disc is on /dev/sda5.

List passwords

sudo cryptsetup luksDump /dev/sda5

Add new password

sudo cryptsetup luksAddKey /dev/sda5

You will be prompted to enter the old password first.

Remove old password

sudo cryptsetup luksRemoveKey /dev/sda5

You should have one more password to preserve encrypted disc accessibility.

LVM documentation