gdm crashes when launching guest session from fast-user-switch-applet

[Justin Dugger]

Binary package hint: gdm

Running Jaunty with current updates.

Clicking on the fast-user-switch guest session should bring up a guest session but instead fails and returns to a locked screen.

Interesting line from gdm log:

[config/dbus] couldn't take over org.x.config:
                 org.freedesktop.DBus.Error.AccessDenied (Connection ":1.41" is
                 not allowed to own the service "org.x.config.display20" due to
                 security policies in the configuration file)

[Sebastien Bacher (seb128)]

reassigning to gdm-guest-session which provides this option

[Martin Pitt (pitti)]

The org.x.config.display20 failure happens here as well, so that's not it (gdm does not ship a d-bus configuration file, and apparently this d-bus service isn't particularly required for fast-user-switch-applet).

- Does user switching work with real users?
- Please attach /var/log/kern.log after a failed attempt with the guest session (might be apparmor errors)
- Please open a Terminal and copy&paste this command:

   sudo sed -i '2 iset -x; exec 2>/tmp/guest-setup.log' /usr/share/gdm/guest-session/guest-session-setup.sh

  Then try to start a guest session. Go back to your real session and attach /tmp/guest-setup.log here.

[Nathaniel W. Turner (nturner)]

I was seeing the same symptom; after modifying guest-session-setup.sh per the previous comment, I found that the following error was being logged:

+ USER=guest
+ PWSTAT=guest P 03/07/2009 0 99999 7 -1
+ echo guest P 03/07/2009 0 99999 7 -1
+ cut -f2 -d
+ [ P != L ]
+ echo User account guest already exists and is not locked
+ exit 1

After running "sudo passwd --lock guest", I can now successfully start guest sessions.

[Martin Pitt (pitti)]

Ah, so you did have a pre-existing guest user. That's part of the design, since it shouldn't tramp over an existing manually created user account.

Thanks for testing!