As I read it, 2190 was a Qt5 bug, yet we have GTK3 now. May be still be related to the graphics toolkit. Or something else, although the error message looks almost the same on my machine.
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I have tried the solution to this older (apparently similar) bug: https://sourceforge.net/p/texstudio/bugs/2190/
In my case, it didn't work in ubuntu 18.04. Rootcause is something else apparently.
As I read it, 2190 was a Qt5 bug, yet we have GTK3 now. May be still be related to the graphics toolkit. Or something else, although the error message looks almost the same on my machine.
development has moved to github.com/texstudio-org/textsudio
please report there.
(and we need the backtrace in /tmp/texstudio...)