HTMLViewer error in Linux

This is probably a lost cause, but:

Has anyone been able to get Xojo to actually run a project using the HTMLViewer in it? I get the following error messages on the console:
Could not load libWebKit
Could not load libGtkHTML

And a popup that says

I’m really close to giving up on Xojo fully since the Linux support has always seemed to be sub par on current distributions.

What distro/version/architecture of Linux? HTMLViewer uses libwebkitgtk version 1, so perhaps that library is not available on your Linux distro?

More info here:

Thanks for the response.
Kubuntu 13.04 64bit is the distro.
dpkg -l libwebkit* shows:
ii libwebkitgtk-1.0-0 1.10.2-0ubuntu1 amd64 Web content engine library for GTK+

If I then do:
sudo apt-get install libwebkitgtk-1.0.0
the system installs:
libjavascriptcoregtk-1.0-0-dbg libwebkitgtk-1.0-0-dbg

Even with the installation of the two additional files, it still gives the same error trying to run an app with only the HTMLViewer in it.