How do I bring your app to the foreground if I can't see an icon anywhere? I just installed Ubuntu for the first time a few weeks ago and genuinely don't see how people are supposed to use it, coming from a Windows/Mac background. How does a Linux user know what's running, without going to a terminal and running top?

The lack of desktop UI affordances in the leading "user-friendly" Linux distribution should be seen as a five-alarm fire by anyone interested in promoting wider Linux acceptance on the desktop. There are reasons why Linux can't get past low single-digit adoption no matter how badly Apple and Microsoft screw their users, and I'm sure the half-assed desktop UI is one of them.