Hopefully someone can enlighten me about a baffling and frustrating issue!
Sometimes when I am doing an installation or a removal, something weird happens. All the open windows disappear, and I see my desktop wallpaper. Then all the windows reappear, but they have no menu bar, so I can't close them. The bar at the top of the screen (with the clock and so on) has also disappeared, as indeed has the Unity Launcher. When this happens, all I can do is wait for the process to finish, and then use CTRL+ALT+DELETE to log out of Ubuntu, then log back in again. Only seems to happen if I am doing updates or installing/removing software.
What exactly is happening here, has anyone else ever seen this, and perhaps most importantly, is there a way to stop this from happening?
Dell Inspiron 530
ATI Radeon HD6670 graphics card (running the latest driver)
And I'm running 64 bit.
There isn't really a "step-by-step" way to reproduce the issue because I can never predict exactly when it will occur. Usually I'm installing a program through Software Center or update manager, maybe running other things in the background - Terminal, Firefox etc. - and then everything flickers, all the windows disappear and then come back with no menu bars.