Delete key no longer cuts unwanted section

[Post producer]

On QT5 Ubuntu 16.04.1, the delete key no longer works and so I have to use edit delete to take out unwanted sections. Is this intended, it slows down editing a lot?

[Jan Gruuthuse]

This could be related to QT appmenu. See if this helps:
Remove appmenu-qt5. Install/ leave installed the  appmenu-qt:amd64
see here for more info:Shortcut ubuntu 16.4.1 QT5] Ctrl x

[Post producer]

Yes, removing appmenu-qt5 has restored the function of the delete key as you suggest. What are the implications of this?

[eumagga0x2a]

The SABDFL once decided to integrate menus of all applications into the top bar of Ubuntu's desktop shell to spare a few px of the precious vertical screen estate (back then, netbooks with 1024x600 displays were the future). It never worked really well. appmenu-qt5 implemented this feature for cooperating applications which used the qt5 toolkit.

Without appmenu-qt5, the menus for these applications will be shown in their menu bars instead of in Unity's top bar. As for all other qt5 applications, they won't suffer from appmenu-qt5 related issues like this one anymore.