full circle magazine #65

15

HOWTO - ADD ENCRYP T ION

you can press Alt-F2 and enter

gksudo gedit), edit the file

/etc/crypttab. Replace the existing

cryptswap1 line as follows

(remember to replace /dev/sdXN

with your swap device).

cryptswap1 /dev/sdXN none

luks

Now edit the file

/usr/share/initramfs-

tools/scripts/local-top/cryptroot.

Search for the following line

(which should be on line 288, but

that could change over time):

message "cryptsetup: unknown

error setting up device

mapping"

Skip to the next blank line

(before FSTYPE='') and insert a

new line (remember to replace

/dev/sdXN):

/sbin/cryptsetup luksOpen

/dev/sdXN cryptswap1

Edit the file

/etc/acpi/hibernate.sh. At the first

blank line, insert the following line.

DEVICE='/dev/mapper/cry p t s w a p

1'

Edit the file /etc/initramfs-

tools/conf.d/resume. Replace the

existing line with:

RESUME=/dev/mapper/cryp t s w a p 1

Edit the file /etc/polkit-

1/localauthority/50-

local.d/com.ubuntu.enable-

hibernate.pkla. The file does not

already exist, so you’ll be creating

it. Add the following lines.

[Re-enable hibernate by

default]

Identity=unix-user:*

Action=org.freedesktop. u p o w e r

.hibernate

ResultActive=yes

Finally, open a terminal and

enter the following command.

sudo update-initramfs -u -k

all

Reboot.

Using Hibernation

When starting, your machine

will prompt you for your new swap

passphrase. Enter it, and you

should continue to a normal login.

If you forget the passphrase,

enter anything. After three failed

attempts, the machine will

continue any way, but with the

swap disabled. Redo this how-to to

reset your passphrase.

Now, you will find Hibernate on

your shutdown menu, and you can

hibernate! If you wish to hibernate

from the CLI (command line

interface), use the command:

sudo pm-hibernate