Thanks for your hint, but I'm not using KUbuntu. I installed the default Ubuntu 18.04 with Gnome. According the latest news, the developer decided to remove the old style application menu bar and replace it with the "pulldown" menu you can see in my screenshot at the right side of the [Applications] button. As far as I know, the application menu should appear there! There are indeed several application working this way.

There is an deprecated gnome extension, that brings back the "old-style" menu, but the devs advised against installing this!

So what now?

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