I am new for Ubuntu and gtk+. When I write a sample program to display the menu by gtk, I notice that the menu does not display until I stop the unity-panel-service. It also happen to terminal and File window too. when i type "stop unity-panel-service" the menu buttons of the desktop dis-appear, but the menu of other window show up. Does it is a bug of Ubuntu 16.04 LTS or I do something wrong?

Before stop unity-panel-service:

before stop unity-panel-service

After stop unity-panel-service:

After stop unity-panel-service


This behaviour seems to be a wide spread problem introduced with Ubuntu 16.04 and which is not fixed for everyone at this time (2016-12-14).

Check: https://bugs.launchpad.net/ubuntu/+source/bamf/+bug/1532226

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