Finally, you can use the your soloKey or other U2F key with openSSH. It is still very early support so you will have to do a bit of compiling yourself. Here’s how!
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!