I installed fedora-31, then update system (dnf update)
Then I installed virtualbox: “dnf install virtualbox”
Now I try launch virtualbox and got error:
Qt WARNING: QSocketNotifier: Can only be used with threads started with QThread
Segmentation fault (core dumped)
Hi @ksandr1v welcome to Ask Fedora!
It looks like that wayland is not support yet.
https://github.com/gyunaev/birdtray/issues/138
How workaround maybe you can try run the session of gnome in xorg mode.
Regards
I have the same issue. In Fedora 30 same VirtualBox worked well
Maybe it is becouse the related package is not starting the layer Xwayland, becouse now XWayland only run in need by legacy X applications instead of starting and running it all the time like it did in Fedora30.
It is that i imagine out but not sure.
Aaah, it could be, thanks! But how could I first start standalone XWayland, then?
Can you launch from a terminal setting QT_QPA_PLATFORM=xcb pathtovirtualbox or modify the desktop file to Exec=env QT_QPA_PLATFORM=xcb …
Works for telegram.
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I think it should do the trick without problem. I use/d gnome box it is alot better for me 
Regards