Yubikey Neo + Ubuntu 18.04.3 LTS

Installing Yubikey module

1) Open terminal and install the Yubikey PPA, this module implements PAM over U2.

sudo apt-get install libpam-u2f

2) Insert the Yubikey and create the folder to store your Yubikey key

mkdir ~/.config/Yubico
pamu2fcfg > ~/.config/Yubico/u2f_keys

3) Yubikey Neo will start flashing, touch it! Now you have configured your key in your profile.

Require Yubikey for Login

1) Open a new terminal to edit the login configuration

sudo vim /etc/pam.d/gdm-password

2) Add the below after the “@include common-auth” line

auth       required   pam_u2f.so

3) Save the file, and logout the session. From now you will need to introduce the Yubikey Neo and press it once you fill the password.