On the Yubikey its also possible to deactivate individual modes. If somehow U2F mode was disabled, it should not work anywhere, but if you don't use the other modes, maybe deactivate them. In earlier version there were some problems.
You're probably missing some library or other. I know I had to install something in debian unstable, but I don't remember what it was. U2F definitely works on Linux, though.
Google supports the U2F standard for logins through Chrome. It's a theoretically standardized browser API, but it's only been implemented in Chrome so far.
Was expecting to be able to use it to log in to Google using their 2FA key.. but only works on Windows from what I can see...
Anyone know anything about this?