Editor missing window controls

I have the following problem:

when i start the Unity Editor (fresh install) i get to choose my projects like normal, but when the Editor window comes up it only opens on the leftmost Screen (i have a 3 screen setup) and i am unable to move the window.
It looks like it is fullscreen since it is totally ignoring the taskbar and such.

Screenshot:



Also the three buttons for minimizing/maximizing/closing are missing.

My System is Ubuntu 18.10.
I tried multiple versions, since it worked for me when i was at 18.04, but no change.

Thank you in advance

 

Hi @hrkrx
Do you use Gnome and have some custom settings?
Could you take a look at https://forum.unity.com/threads/error-unity-wont-show-top-menu.605944/, maybe it is a similar issue.

 

Thank you for your answer it seems to be a similar Issue, but i haven't done anything to my gnome :/

But I'll try asking what he changed anyway ^^