I'm testing with a brand new Yubikey 4, and after adding the rules in
comment #16, I was seeing more denials which prompted me to add the
following two rules:

    /run/udev/data/c14:[0-9]* r,
    /sys/devices/pci**/usb*/**/report_descriptor r,

With those the denials went away, but U2F registration still fails. I'm
using https://demo.yubico.com/u2f?tab=register to test, and seeing the
following error:

Registration failed!
Make sure you have a U2F device connected, and try again.

 Traceback (most recent call last):
  File "/root/python-u2flib-server-demo/examples/yubiauth_server.py", line 161, 
in __call__
    raise Exception("FIDO Client error: %s" % error)
Exception: FIDO Client error: 1 (OTHER ERROR)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1738164

Title:
  [snap] U2F doesn't work with yubikey

Status in chromium-browser package in Ubuntu:
  Confirmed

Bug description:
  (initially reported by Daniel at https://forum.snapcraft.io/t/call-
  for-testing-chromium-62-0-3202-62/2569/50)

    « U2F (Universal 2nd Factor) isn’t working when signing into my
  gmail account trying to use my yubikey. This is a USB device which
  IIRC chromium needs bidirectional communication with. »

  This requires investigation, but the yubikey I have is too old and
  doesn't support U2F.

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