i did an upgrade from 13.10 to 14.04. Now the switch user option does not work any more. the logged in user has to log out before any other user can log in.
Any idea how to fix this ?
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I had the same problem and the problem was the display manager. I previously had "gdm" and solved my problem by switching to "lightdm" Display Manager.
sudo dpkg-reconfigure lightdm
In my case I had "gdm" selected and I selected "lightdm" instead. Reboot and login again. Now, account switching should work both while logged in and from the lock screen.
Potentially you need to install lightdm.
sudo apt-get install lightdm
My machine was initially installed as a 12.04 server, and then I added Unity and finally upgraded to 14.04.1.