Hello, just booted up Ubuntu again after a while and this bar at the bottom just appeared. I don't remember it having been there earlier and I wondered if it is supposed to be there, and if not how do I remove it?
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You appear to be logged in into the Gnome Classic session. You must have installed it at some point, and then have logged in to it, because it is not installed with Ubuntu by default.
This session mimicks the traditional Gnome 2 desktop by providing an application menu and, on the bottom, a window list. These features are provided by officially supported Gnome Shell extensions.