Errors after installing Virtualbox 6.0

[L0rdM3rphy]

I am new here, so if I am not in the correct forum area please let me know. Anyways, I recently installed Fedora 29 workstation on 3 computers (2 desktops and one laptop) to which I have installed Virtualbox successfully on two. The two that Virtualbox installed on did so without issue. I simply downloaded Virtualbox and installed through the Software Center install button and Virtualbox popped right up.

My third computer however is non-compliant. I tried to install through download/Software Center install and it throws up no errors, but when I click the icon to open it I get nothing. So I attempted following install guides/instructions from both if-not-true-then-false and nixcraft websites. The installation went fine, but I was greeted with the following errors when attempting to launch Virtualbox from the Terminal.

Qt WARNING: QXcbConnection: XCB error: 3 (BadWindow), sequence: 419, resource id: 25165828, major code: 2 (ChangeWindowAttributes), minor code: 0
Qt WARNING: QXcbConnection: XCB error: 3 (BadWindow), sequence: 420, resource id: 25165828, major code: 18 (ChangeProperty), minor code: 0  ... continued for like 3 pages

So I was hoping someone could assist me with getting this figured out as this is my main computer. Hardware specs EVGA H370 itx mobo, i5-8500, 8gb GSkill Aegis Ram 2400mhz, and GTX 760. FYI secure boot is disabled, but am running Fedora in EFI.

[bobx001]

You maybe missing some QT libraries.

in my case I have:

[root@nova ~]# rpm -qa | grep -i qt | sort -n
adwaita-qt5-1.0-5.fc29.x86_64
dbusmenu-qt-0.9.3-0.18.20150604.fc29.x86_64
dbusmenu-qt5-0.9.3-0.18.20150604.fc29.x86_64
ibus-qt-1.3.3-20.fc29.x86_64
imsettings-qt-1.7.3-6.fc29.x86_64
libaccounts-qt5-1.15-6.fc29.x86_64
libyui-qt-2.47.1-13.fc29.x86_64
phonon-qt5-4.10.1-2.fc29.x86_64
phonon-qt5-backend-gstreamer-4.9.0-9.fc29.x86_64
polkit-qt5-1-0.112.0-14.fc29.x86_64
poppler-qt5-0.67.0-10.fc29.x86_64
python3-pyqt5-sip-4.19.13-3.fc29.x86_64
python3-qt5-5.11.3-1.fc29.x86_64
python3-qt5-base-5.11.3-1.fc29.x86_64
python-qt5-rpm-macros-5.11.3-1.fc29.noarch
qca-qt5-2.2.0-0.5.20180619.fc29.x86_64
qt3-3.3.8b-76.fc29.x86_64
qt-4.8.7-44.fc29.x86_64
qt5ct-0.35-5.fc29.x86_64
qt5-qtbase-5.11.3-1.fc29.x86_64
qt5-qtbase-common-5.11.3-1.fc29.noarch
qt5-qtbase-gui-5.11.3-1.fc29.x86_64
qt5-qtconnectivity-5.11.3-1.fc29.x86_64
qt5-qtdeclarative-5.11.3-1.fc29.x86_64
qt5-qtenginio-1.6.2-20.fc29.x86_64
qt5-qtgraphicaleffects-5.11.3-1.fc29.x86_64
qt5-qtimageformats-5.11.3-1.fc29.x86_64
qt5-qtlocation-5.11.3-1.fc29.x86_64
qt5-qtmultimedia-5.11.3-1.fc29.x86_64
qt5-qtquickcontrols2-5.11.3-1.fc29.x86_64
qt5-qtquickcontrols-5.11.3-1.fc29.x86_64
qt5-qtscript-5.11.3-1.fc29.x86_64
qt5-qtsensors-5.11.3-1.fc29.x86_64
qt5-qtserialport-5.11.3-1.fc29.x86_64
qt5-qtspeech-5.11.3-1.fc29.x86_64
qt5-qtspeech-speechd-5.11.3-1.fc29.x86_64
qt5-qtsvg-5.11.3-1.fc29.x86_64
qt5-qttools-common-5.11.3-1.fc29.noarch
qt5-qttools-libs-designer-5.11.3-1.fc29.x86_64
qt5-qttools-libs-help-5.11.3-1.fc29.x86_64
qt5-qtwayland-5.11.3-1.fc29.x86_64
qt5-qtwebchannel-5.11.3-1.fc29.x86_64
qt5-qtwebengine-5.11.3-3.fc29.x86_64
qt5-qtwebkit-5.212.0-0.31.alpha2.fc29.x86_64
qt5-qtwebsockets-5.11.3-1.fc29.x86_64
qt5-qtx11extras-5.11.3-1.fc29.x86_64
qt5-qtxmlpatterns-5.11.3-1.fc29.x86_64
qt5-srpm-macros-5.11.3-1.fc29.noarch
qt-common-4.8.7-44.fc29.noarch
qt-settings-29.0-1.fc29.noarch
qt-x11-4.8.7-44.fc29.x86_64
sni-qt-0.2.6-12.fc29.x86_64

Also, at least in my case, I have in my .bash_profile:

QT_QPA_PLATFORMTHEME=qt5ct
export QT_QPA_PLATFORMTHEME

(I only do this however so that KDE apps can have a dark background)

[L0rdM3rphy]

So apparently even though I thought Virtualbox installed correctly on my other computers I was mistaken. I tried to create a Virtual Machine on them, but it wanted me to install some other things so that it could write to the kernel or something. I did attempt to install the dependencies, but it still didn't work. I have spent too much time trying to get this working, so I have decided to just use the built-in "Boxes" for my Virtual Machines. I think the problems lie with the Virtualbox installer and need to be addressed on their end.
So, since I am new here do I need to put "Unsolved / Gave Up" or something at the title of the thread, so others know this thread didn't go anywhere? Someone please let me know and I will oblige. Thanks.

[bobx001]

Well, in my case, since I am using the rpmfusion NVIDIA driver, I always have dkms installed. Since I am a programmer, I also have gcc installed.
I make sure my BIOS has Virtualization turned on (SVM in the case of Asus/Ryzen).

And installing virtualbox is a jiffy, dnf install .... and that's it. I've never had any issues.
It does compile its own kernel module (vboxsrv), which is probably what is missing on your end.