Yubikey FIDO error: "A timeout occurred while waiting for a Security Key to be inserted or tapped."

If you're putting a Yubikey FIDO USB U2F key into your Linux machine, and activation eventually times out with this error:

"A timeout occurred while waiting for a Security Key to be inserted or tapped."

... this may be due to ownership of the device.

The fix, via this Yubico forums post:

echo 'KERNEL=="hidraw*", SUBSYSTEM=="hidraw", MODE="0664", GROUP="plugdev", ATTRS{idVendor}=="1050", ATTRS{idProduct}=="0113|0114|0115|0116|0120"' | sudo tee /etc/udev/rules.d/70-u2f.rules

Before:

crw------- 1 root root 250, 6 Oct 27 21:57 hidraw6

After:

crw-rw-r-- 1 root plugdev 250, 6 Oct 27 21:59 hidraw6

Activation should now proceed normally. Some folks had to then also restart Chrome. Chrome 38 or higher required.