To set up your Linux system for U2F:
- If you have a YubiKey NEO or YubiKey NEO-n ensure you have unlocked the U2F mode by following the instructions in the Enabling or Disabling Connection Interfaces article.
- Go to https://github.com/Yubico/libu2f-host/blob/master/70-u2f.rules and download or create a copy of the file named 70-u2f.rules into the Linux directory: /etc/udev/rules.d/ If this file is already there, ensure that the content looks like the one provided on github.com/Yubico (link above).
- Note: If your version of UDEV is lower than 188, use the rules at https://github.com/Yubico/libu2f-host/blob/master/70-old-u2f.rules instead. If you do not known your udev version, you can check by running "sudo udevadm --version" in a Terminal.
- Save your file, and then reboot your system.
- Ensure that you are running Google Chrome version 38 or later. Starting with Chrome version 39, you will be able to use the YubiKey NEO or YubiKey NEO-n in U2F+HID mode.