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https://forum.unity.com/threads/scrolling-editor-unity-2018-2-2f1.544847/ Check this post, it has a fix for this problem
I have to mention that everything that opens the OS's native file browser is not working.
Worked for me! Thanks a lot! Btw, how have you come to this solution?
Having the exact same issue with Unity 2018.2.0f2 on Elementary OS 0.4.1 Loki. I haven't tested with newer versions of the Editor nor the OS....