Getting the fingerprint reader of a Thinkpad x240 to work under Ubuntu 14.04

README.md

lsusb lists the fingerprint reader in the x240 as follows:

Bus 002 Device 003: ID 138a:0017 Validity Sensors, Inc.

There exists experimental driver support for this in a fork of libfprint for vfs5011 sensors, however you'll need to compile the driver yourself. To get the fingerprint sensor to work for lightdm login, su etc, follow these steps.

1. Install fingerprint-gui:

   sudo add-apt-repository ppa:fingerprint/fingerprint-gui
   sudo apt-get update
   sudo apt-get install libbsapi policykit-1-fingerprint-gui fingerprint-gui
   

2. Get your compilation tools and library dependencies:

   sudo apt-get install build-essential automake checkinstall shtool libtool libxv-dev libmagick++-dev
   

3. Get the sources, compile and install them:

   git clone https://github.com/abbradar/fprint_vfs5011
   cd fprint_vfs5011
   ./autogen.sh
   make
   sudo make install
   

4. Make sure your user has permissions for accessing the fingerprint sensor device. Create a file /lib/udev/rules.d/40-libfprint0-custom.rules with the following contents:

   # Device Validity VFS5011
   ATTRS{idVendor}=="138a", ATTRS{idProduct}=="0017", MODE="0664", GROUP="plugdev"
   

5. Add your user to the plugdev group:

   sudo usermod -a -G plugdev <username>
   

6. Restart udev:

   sudo service udev restart
   

7. Log out of your session and log back in.

8. Enroll your fingerprints with fingerprint-gui, verify them, then see if a sudo -s now suddenly asks you for your fingerprint.

Just to add to the last part of @Lesik comment, make sure you swipe your finger fast so you get an actual fingerprint look in the capture, instead of just a stretched fingerprint.

i installed all packages and libraries, i didn't get the build to work after 'make' fprint, but i fingerprint-gui worked on ubuntu 17.10 and Thinkpad X240, i set up my fingerprint and now kdm login ask for fingerprint and it works!

I followed all the steps and when I do

sudo -s

I am asked for my fingerprint and if I swipe that, it authenticates. So that worked.

However, I cannot swipe my finger at login (Ubuntu 18.04.1). There is no option to enable fingerprint login in the 'Users' section of Ubuntu's preferences. Any idea how I can activate it? ^^