a better (less drastic) workaround is to unset the environment variable 
QT_QPA_PLATFORMTHEME, this variable is set to: 
     QT_QPA_PLATFORMTHEME=appmenu-qt5

the following will bring back the missing menu bar
     export QT_QPA_PLATFORMTHEME=

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https://bugs.launchpad.net/bugs/1307619

Title:
  Qt Creator Menu bar is missing at Gnome3 or KDE Desktop

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