id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host
17425,Ubuntu 18.04 xcb not found... but found.,3vi1J,,"Attempting to start virtualbox produces the following error:

------------------------------
08:56:19 evil@sager ~» virtualbox
Qt FATAL: This application failed to start because it could not find or load the Qt platform plugin ""xcb""
in """".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)
----------------------------------

Oddly the message lists xcb as an available plugin.

Attempting to run VirtualBox as root, and to force the library path (P=/usr/lib/virtualbox; sudo LD_LIBRARY_PATH=$P:$P/plugins/platforms $P/VirtualBox) produces the same error as seen above.

Running ldd, there appear to be no missing dependencies for any of the virtualbox libraries or libqxc

----------------------------------
09:06:47 evil@sager ~» ldd /usr/lib/virtualbox/*.so | grep not
09:06:50 evil@sager ~» 

09:25:32 evil@sager ~» ldd /usr/lib/virtualbox/components/*.so | grep not
09:26:17 evil@sager ~»

09:04:44 evil@sager ~» ldd /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so | grep not
09:05:44 evil@sager ~» 
----------------------------------

Only the extension pack VNC files, which I wouldn't think would be necessary to start the GUI show anything not found:

----------------------------------
09:29:23 evil@sager ~» ldd /usr/lib/virtualbox/ExtensionPacks/VNC/linux.amd64/*.so | grep not
        VBoxRT.so => not found
        VBoxRT.so => not found
09:29:40 evil@sager ~»
----------------------------------

What I've tried:

1.  apt uninstalling (with --purge) virtualbox* and re-installing.  Same results.

2.  apt uninstalling (with --purge) virtualbox* and backleveling to v5.1.  Same results.

3.  apt uninstalling (with --purge) virtualbox* and re-installing using the latest deb downloaded from your site rather than the artful repo.  Same results.

4. sudo ln -s /usr/lib/x86_64-linux-gnu/qt5/plugins /usr/lib/virtualbox/plugins  (same results)

5. sudo ln -s /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms /usr/lib/virtualbox/platforms  (same results)

6. sudo ln -s /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so /usr/lib/virtualbox/libqxcb.so  (same results)

7. Re-installed _all_ of the Qt5 libraries and rebooting.  Same results.

8. Running a trace (I will attach it to the ticket).  Line 1313 is where it loads libqxcb.so.


I'm not having any issues with any other Qt5 applications on this system - and even use it to develop Qt5 apps.  Any help figuring this out would be appreciated.",defect,new,GUI,VirtualBox 5.2.4,,xcb,,all,Linux