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

[Paul Smith]

On Fri, 2017-03-03 at 17:55 +0000, Grizzly wrote:
> 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

Nothing strange-looking (to me) in there:

  $ grep '^[^#]' /etc/pam.d/common-auth
  auth    [success=1 default=ignore]      pam_unix.so nullok_secure
  auth    requisite                       pam_deny.so
  auth    required                        pam_permit.so
  auth    optional                        pam_cap.so