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Probably a udev problem, you need:

https://developers.yubico.com/libu2f-host/

or maybe even better:

https://github.com/amluto/u2f-hidraw-policy

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.

Probably its the first one.

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.