I'm not going to provide this interface in LightDM due to:
- All other DMs will have the same problem
- The interface is GDM specific
- (as I understand it) It allows a session process to run PAM calls remotely to
authenticate. This is questionable security and opposes the design we have in
LightDM for the login screen to be the lock screen.
- The interface is not trivial
So the solution as I see it is we will have to patch gnome-shell to
handle not running inside GDM. The options are probably.
1. Not entering lock screen if the GDM interface is not present. This means no
lock screen but is logical (no point locking if you know you can't unlock).
2. If the GDM interface is not present then falling back to the old
gnome-screensaver method of unlocking. This means running the PAM calls
yourself to authenticate. You can't authenticate as anyone but yourself and
it's always been a bit of a hack (PAM generally assumes root access, the
modules handle running as non-root for this case specifically).
** Also affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Changed in: lightdm (Ubuntu)
Status: New => Won't Fix
** Changed in: lightdm (Ubuntu)
Importance: Undecided => Medium
** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => High
** Changed in: gnome-shell (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1042907
Title:
LightDM doesn't handle Lock Screen or Switch Session for GNOME Shell
3.5
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