Encrypting Custom Pop!_OS Install

Table of Contents

The issue #

Pop!_OS gives the option to encypt the drive. However this is if you go with the default option. Which erases the whole drive and puts Pop!_OS on it. This is not good if you’re dual booting or have some other partitions you want to keep. Luckily it’s not too hard to setup using LUKS.

Set up your custom partitons #

Use Gparted to setup the boot and root partition. Know the partition to encrypt. You want to leave the boot partition unencrypted. In this example I’ll pretend the partition I want to encrypt is /dev/sdx, where x is some number.

Format partition with LUKS #

# Format the partition
sudo cryptsetup luksFormat --type luks2 /dev/sdx

# Open the parition
sudo cryptsetup luksOpen /dev/sdx crypt_sdx

# Create a physical volume
sudo pvcreate /dev/mapper/crypt_sdx

Verify physical volume #

List all LVM physical volumes and verify that it got created correctly.

sudo pvs
# It should look something like this
# PV                    VG Fmt  Attr PSize   PFree
# /dev/mapper/crypt_sdx    lvm2 ---  240.00g 240.00g

Create volume group #

Create a new LVM volume group on physical volume. I’ll call it pop

sudo vgcreate pop /dev/mapper/crypt_sdx

Create logical volume #

Create the logical volume. I’ll call it root. This will take up all the space in the volume group pop.

sudo lvcreate -n root -l +100%FREE pop

Verify logical volumes got created correctly #

sudo lvs
# Should look something like this
# LV   VG    Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
# root pop   -wi-a----- 240.00g

Last steps #

Now go through the installation wizard, select Custom (Advanced) for partitioning. Select the /dev/sdx partition from earlier and it will ask you for the encryption password. Select the logical volume within the encrypted partition as the destination for the OS installation. Finish the installation as usual. And… that’s it! Pop!_OS! will ask you for your disk password on every boot.

When you login, you’ll be prompted to enter the encryption password. After that it’ll ask you for your login password. This is pretty annoying, especially if you’re using the same password for encryption and login.

Note: Don’t worry it’ll still ask for you login password after you lock or suspend your computer.

Edit the /etc/gdm3/custom.conf and edit the daemon section in the file

# /etc/gdm3/custom.conf
...
[daemon]
...
# Enabling automatic login
   AutomaticLoginEnable = true
   AutomaticLogin = user
...

Replace the username with the your actual username.

Then just restart and it should apply :)