Can't shutdown and logout from top panel in Ubuntu 14.04 LTS

I recently installed Ubuntu 14.04. Shutdown and logout from the top panel are not working.

They worked fine when installing the OS, but a few days back I installed fglrx drivers for my ATI graphics card. They didn't work and I got low resolution problems and Ubuntu didn't boot. I solved it by removing the fglrx graphic driver from the recovery mode and Ubuntu started to boot and work just fine, at least that's what I thought.

But now the shutdown and logout options in the top panel don't work. I have to logout using ctrl+alt+delete and shutdown with the shutdown option in the top panel (shutdown option works after logging out but not when logged in as a user).

I re-installed Ubuntu 14.04 LTS and shutdown options worked fine but after installing updates they stopped working again. I thought its the graphic driver fglrx installation problem but now i know its not that. I think its a problem with some file that got installed from Ubuntu updates.
Does any one know how to solve it?

Solution 1:

No need to remove cairo-dock from start-up applications.

Use one of the these solutions:

• Find cairo-dock.desktop file ~/.config/autostart and add this code,X-GNOME-Autostart-Delay=20

Steps to solve easily (tested in Ubuntu 14.04)

1. Run gedit without root
2. Click open file menu and press Ctrl+H
3. Open file ~/.config/autostart/cairo-dock.desktop

4. Add this

   X-GNOME-Autostart-Delay=20
   

5. Save and close

6. Reboot your unity/gnome

Delay time more than 20 works fine.

or:

• Select cairo-dock startup application from startup application and change command option to:

  sh -c "sleep 30; exec cairo-dock -o"
  

  source here and here

or

• Create a script called startdock, with the text

  #! /bin/sh -e
  sleep 20
  cairo-dock
  exit 0
  

  Make it executable, and in the startup items add a new command with path to this script.

This is a bug as indicated in a comment. The bug report states that

Unity's shutdown/restart dialogue is not working when another application is registered to LauncherEntry interface of Unity DBus. It seems we have this bug when Cairo-Dock (and its Launcher-API-Deamon), DockbarX or Plank are launched before Unity.

To solve the same problem with Plank dock, replace cairo-dock with plank in one of the above solutions. The same for other applications.

Solution 2:

This method is better than the others since the problem is solved and Cairo Dock starts with almost no delay.

Edit /usr/lib/x86_64-linux-gnu/cairo-dock/cairo-dock-launcher-API-daemon as root.

Add the following line at line 33:

from time import sleep

and the following line at line 241 (just before ULWatcher()):

sleep(5)

Then, restart the session.

If you're using a 32bit version of Ubuntu, the file will probably be in -

/usr/lib/cairo-dock/cairo-dock-launcher-API-daemon

This solution has been taken from the Launchpad Bug Page.