Guest session fails to log out

[Sean Davis]

Vanilla Xubuntu install. When logging out from the guest session, everything is closed and the desktop wallpaper is the only thing that remains. The user is never returned to the login screen.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: xfce4-session 4.12.1-3ubuntu2
ProcVersionSignature: Ubuntu 4.8.0-11.12-generic 4.8.0-rc6
Uname: Linux 4.8.0-11-generic x86_64
ApportVersion: 2.20.3-0ubuntu7
Architecture: amd64
CurrentDesktop: XFCE
Date: Sat Sep 24 09:18:31 2016
InstallationDate: Installed on 2016-09-24 (0 days ago)
InstallationMedia: Xubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160921)
SourcePackage: xfce4-session
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 2.20.3-0ubuntu7
Architecture: amd64
CurrentDesktop: XFCE
DistroRelease: Ubuntu 16.10
InstallationDate: Installed on 2016-09-24 (0 days ago)
InstallationMedia: Xubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160921)
Package: lightdm 1.19.4-0ubuntu1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 4.8.0-11.12-generic 4.8.0-rc6
Tags: yakkety
Uname: Linux 4.8.0-11-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True

[Sean Davis (bluesabre)]

apport information

[Sean Davis (bluesabre)]

apport information

[Sean Davis (bluesabre)]

apport information

[Sean Davis (bluesabre)]

apport information

[Sean Davis (bluesabre)]

apport information

[Sean Davis (bluesabre)]

apport information

[Sean Davis (bluesabre)]

apport information

[Sean Davis (bluesabre)]

Comments #2 - 8 are from using apport-collect with lightdm

[Launchpad Janitor (janitor)]

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

[Gunnar Hjalmarsson (gunnarhj)]

Tested with Ubuntu MATE, and the guest session works fine there, so the issue is probably not caused by lightdm. Possibly the Xubuntu specific parts of lightdm-gtk-greeter should be looked at.

[Kev Bowring (flocculant)]

test@test-Standard-PC-i440FX-PIIX-1996:~$ dmesg | grep DENIED
[ 50.801345] audit: type=1400 audit(1474991831.922:27): apparmor="DENIED" operation="mknod" profile="/usr/lib/lightdm/lightdm-guest-session" name="/proc/1722/fd/2" pid=1722 comm="lightdm-session" requested_mask="c" denied_mask="c" fsuid=996 ouid=996
[ 50.803080] audit: type=1400 audit(1474991831.922:28): apparmor="DENIED" operation="mknod" profile="/usr/lib/lightdm/lightdm-guest-session" name="/proc/1724/fd/2" pid=1724 comm="lightdm-session" requested_mask="c" denied_mask="c" fsuid=996 ouid=996
[ 50.932125] audit: type=1400 audit(1474991832.054:29): apparmor="DENIED" operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1846 comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send receive accept" denied_mask="send accept" addr="@/com/ubuntu/upstart-session/996/1720" peer_addr=none peer="unconfined"
[ 50.941490] audit: type=1400 audit(1474991832.062:30): apparmor="DENIED" operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1862 comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send receive accept" denied_mask="send accept" addr="@/com/ubuntu/upstart-session/996/1720" peer_addr=none peer="unconfined"
[ 50.946784] audit: type=1400 audit(1474991832.066:31): apparmor="DENIED" operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1866 comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send receive accept" denied_mask="send accept" addr="@/com/ubuntu/upstart-session/996/1720" peer_addr=none peer="unconfined"
[ 50.949328] audit: type=1400 audit(1474991832.070:32): apparmor="DENIED" operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1870 comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send receive accept" denied_mask="send accept" addr="@/com/ubuntu/upstart-session/996/1720" peer_addr=none peer="unconfined"
[ 50.951780] audit: type=1400 audit(1474991832.074:33): apparmor="DENIED" operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1874 comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send receive accept" denied_mask="send accept" addr="@/com/ubuntu/upstart-session/996/1720" peer_addr=none peer="unconfined"
[ 50.954141] audit: type=1400 audit(1474991832.074:34): apparmor="DENIED" operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1878 comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send receive accept" denied_mask="send accept" addr="@/com/ubuntu/upstart-session/996/1720" peer_addr=none peer="unconfined"
[ 62.395078] audit: type=1400 audit(1474991843.538:35): apparmor="DENIED" operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=2127 comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send receive accept" denied_mask="send accept" addr="@/com/ubuntu/upstart-session/996/1720" peer_addr=none peer="unconfined"
[ 62.397757] audit: type=1400 audit(1474991843.542:36): apparmor="DENIED" operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=2129 co...