'TouchScreenKeyboard not opening on standalone linux

I first was using the VirtualKeyboard class for windows from this unity forum post. But this did not open the virtual keyboard for stand alone linux. I also tried the build in TouchScreenKeyboard via:

TouchScreenKeyboard.Open("", TouchScreenKeyboardType.Default, false, false, false);

But this also does not work. Anyone any idea to open the build in virtual keyboard of linux(ubuntu)? Already big thanks.



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