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Setting up Debian based Linux PC with Fingerprint Authentication

Here’s the complete step-by-step guide including cosmic-greeter setup for fingerprint login on Pop!_OS:_OS

#

 

Fingerprint Setup on Pop!_OS (Lenovo ThinkPad with COSMIC)

##

1. Install Required Packages
```bash
sudo apt update && sudo apt install fprintd libpam-fprintd

2.

  1. Reinstall cosmic-greeter (if needed)
    . Ensure the login manager is working: 

sudo apt install --reinstall cosmic-greeter

3.

  1. Enable Fingerprint in PAM
sudo pam-auth-update

    Use arrow keys to select "Fingerprint authentication".
     Press Space, then Tab → Enter.
    4.Enter Enroll Your Fingerprint
    fprintd-enroll

      Swipe your finger until you see enroll-completed.
       You can specify a finger:
      finger 
      fprintd-enroll -f right-index-finger

      5.

      1. Reboot
      sudo reboot

      After reboot:reboot

        Go to Settings > Users — you should see "Fingerprint Login" enabled.
        6.enabled Use Fingerprint
        At login: Swipe instead of typing password.password
        For sudo: Run sudo ls and use your finger.
        finger

         

        Troubleshooting

          No fingerprint option?
          sudo pam-auth-update --enable fprintd

          BIOS conflict (ThinkPad):

          Enter BIOS → Security → Fingerprint → Disable "Predesktop Authentication".

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