Comment 87 for bug 1003950

I found a way to duplicate this issue.

Run the following script in a terminal:
    #!/bin/sh
    sleep 10
    update-manager --no-focus-on-map

Before the update-manager pops up, log into a "Guest Session". Wait about 10 seconds, then switch back. Enter your password at the greeting screen. Then you'll see a 'Enter the root password' type of box since update-manager needs root permissions. I hit cancel on that window. Finally, there will be an update-manager icon (the green A with a progress bar through it) in the list of program at the left, but it can't be clicked on to bring it up. It can be right-clicked to close it. Also, alt-tab shows it, but won't switch to it.

Potential pre-requisites: I'm running on a laptop with an external monitor. They are different resolutions. Also there is an update available to install. I'm running Ubuntu 14.04, but I've seen it on 12.04.

Interestingly enough, my "Guest Session" runs on tty F8, meaning that I can press Ctrl-Alt-F8 and see the guest session. When I press Ctrl-Alt-F7 I get my normal session.

I have no clue how to continue looking at this problem.