I have tried switching theme/icon theme. Does not work. After some
googling though I came up with a workaround: Open GNOME Tweaks / Top Bar
and switch on/off the "Application Menu". This did the trick for me.
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Desktop Bugs,
The behavior remains identical after upgrading to 18.04.
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https://bugs.launchpad.net/bugs/1752140
Title:
Gedit menu button disappear (17.10)
To manage notifications
Public bug reported:
The menu button of Gedit somehow disappeared (see attached screenshot).
This happens only to one user (myself) on the system with Xorg, as it
appears normally in my wife's account on the same computer, as well as
on root. On Wayland, the button is there, but many options are