Trying to connect my ASUS Nexus Gamepad on my Lenovo Thinkpad x250

I have an old ASUS Nexus Gamepad that works with my Nexus Player AndroidTV box and I'm trying to get it to work on my Thinkpad. The gamepad is bluetooth and is recognized when I connect it but unfortunately Linux doesn't seem to know what to do with it, especially with Steam. I tried installing xboxdrv following instructions I found but haven't really been able to make anything work for me. I found these instructions with mappings but I haven't been able to figure out how to make that work either. (Where is "/games/xboxdrv/"? at exactly? "/dev/udev/rules.d/" doesn't seem to exist?)

Would really appreciate some assistance translating this into something that will work for me. Thanks.