Two lock screens. Ubuntu and Gnome - parallel. Why?

[Sergei Solo]

When my laptop wake up from suspend I should enter my user password twice. First I see regular LightDM screen (I changed it to the LightDM from Ubuntu Login Screen), after press Enter - I see Gnome Lock screen (with black top panel) and I should enter my user password again.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.9.12-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
Uname: Linux 3.13.0-18-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Mar 21 17:13:08 2014
InstallationDate: Installed on 2014-03-18 (3 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140317)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Sergei Solo (solomatkins)]

Gnome Lock screen process name is "gnome-screensaver-dialog"

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Simon Déziel (sdeziel)]

I don't believe this is a duplicate of LP: #1288241 as I don't have apparmor-notify installed yet I have this bogus behaviour on resume.

Here are some debug info based on https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/1288241/comments/13:

$ ps auxww|grep [g]nome-screensaver
simon 4926 0.0 0.3 510560 24080 ? Sl 08:35 0:02 /usr/bin/gnome-screensaver --no-daemon
simon 5572 0.0 0.1 473948 15480 ? Sl 08:40 0:00 /usr/bin/gnome-screensaver --no-daemon

$ cat /proc/4926/environ | tr '\0' '\n'|grep UPSTART_SESSION
UPSTART_SESSION=unix:abstract=/com/ubuntu/upstart-session/1000/4683
$ cat /proc/5572/environ | tr '\0' '\n'|grep UPSTART_SESSION
  # nothing showed in that grep
$ cat /proc/4926/environ | tr '\0' '\n'|grep DBUS_SESSION
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-FhuyEq4d9X,guid=c156604da8fe0782de11a61a53341afe
$ cat /proc/5572/environ | tr '\0' '\n'|grep DBUS_SESSION
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-C3BaSOeR1G,guid=d2a6b4f0d7acab4bcd28b4a953341c22
$ cat /etc/X11/Xsession.d/90apparmor-notify
cat: /etc/X11/Xsession.d/90apparmor-notify: No such file or directory

$ dpkg -l| grep apparmor
ii apparmor 2.8.95~2430-0ubuntu2 amd64 User-space parser utility for AppArmor
ii libapparmor-perl 2.8.95~2430-0ubuntu2 amd64 AppArmor library Perl bindings
ii libapparmor1:amd64 2.8.95~2430-0ubuntu2 amd64 changehat AppArmor library

[Sebastien Bacher (seb128)]

duplicate of bug #1292451 then?

[Alberto Salvia Novella (es20490446e)]

It's estimated to have a moderate impact on a large portion of Ubuntu users.

[Simon Déziel (sdeziel)]

On 14-03-27 06:47 PM, Sebastien Bacher wrote:
> duplicate of bug #1292451 then?

Most likely as I just was able to reproduce #1292451 here.

Thanks

[ScarySquirrel (coproc-sbcglobal)]

Quick note on English, the word to use is "must", not "should", here.

[ScarySquirrel (coproc-sbcglobal)]

I tried replacing LightDM with GnomeDM, to no avail.

I also tried deleting LightDM with the following: http://linuxandfriends.com/change-default-display-manager-ubuntu-linux/

This did not work, and I had to change the text file back to the original by pressing ctrl-alt-f5 and editing it in a shell.

Reinstalling GDM does not work, either, http://askubuntu.com/questions/69706/is-it-safe-to-uninstall-gdm-when-using-lightdm notwithstanding.