Sometimes a hardware key is not for added security but simply for added simplicity. This time I give a quick intro to how you can use a SoloKey (or other U2F/FIDO2 HW key) as a quick Linux login mechanism.
If you want to have extra security for your linux machine besides the usual password. Then get yourself a SoloKey or other hardware U2F key and use that as secondary login. Here I give you the description on how to install and configure everything for using Solokeys with your linux. Enjoy!