Segmentation fault in libQt5Widgets.so when trying to open preferences

[akerka]

When I open Preferences (File->Preferences) a dialog window appears and then application crashes.

GUI is an package virtualbox-qt (5.1.34-dfsg-0ubuntu1.16.04.2) from Linux Mint's repository. In syslog I see messages like this:

"kernel: [ 6494.722842] VirtualBox[954]: segfault at 28000002c ip 00007fe52d0277b1 sp 00007ffd04fb9380 error 4 in libQt5Widgets.so.5.5.1[7fe52cbfe000+659000]"

I tried reinstall all it but it not helps. Application I have downloaded directly from virtualbox.org works fine. Seems, its GUI doesnt use qt.

My version Linux is Mint 18.3 x64

[akerka]

I have to correct version of virtualbox installed. It's 5.1.34.

[Socratis]

Do not use the fork version from Ubuntu. If you do, you can either ask in their forums for help, or completely remove/uninstall/delete/purge their version and install the official version from the Downloads section of VirtualBox.

Oh, and the official version, *does* use Qt. It's just that your Ubuntu Qt and the one that they use in their fork are not compatible. Again, only the official one is supported.

Finally, may I suggest something? It's usually better and faster, if issues get first addressed in the ​VirtualBox forums. More than 95% of the issues are resolved over there, which keeps the developers focusing on the bug fixes and enhancements, and there is no need for another ticket to keep track of. For example, yours is not a bug and someone from the developers has to deal with it and close it as "Invalid".