Bug#1031389: gdm3: installing fprintd, but not libpam-fprintd makes login via gdm impossible

[Ansgar]

On Thu, 2023-02-16 at 10:20 +0000, Simon McVittie wrote:
> > I logged in via getty and installed libpam-fprintd and could login
> > again.
> > 
> > GDM should not make login impossible when fprintd is installed and
> > libpam-fprintd is not. Login via password should still be possible
> > in
> > this case.
> 
> In principle the /etc/pam.d/gdm-fingerprint PAM stack could probably
> fall back to password authentication, but I'm not sure how that would
> be achieved. Marco Trevisan would probably know better?

GDM does still allow password login as a fallback, but only when
libpam-fprintd is installed. Otherwise login fails before a password
prompt is shown.

Ansgar