Ubuntu 16.04: screen unlock fails if my phone is plugged in?

[Grizzly]

03 March 2017  at 11:26, Paul Smith wrote:
Re: Ubuntu 16.04: screen unlock fai (at least in part)

>On Fri, 2017-03-03 at 16:20 +0000, Grizzly wrote:
>> Any chance you setup Pam to use that phone as a key?
>
>Not knowingly, for sure :).

>I have no idea how to do that, or to check whether it has been done.

You can check by looking at 

/etc/pam.d/common-auth

with your favorite text editor