> Tried to install qt4-x11 but the terminal says "unable to locate package qt4-x11"
You wouldn't install qt4-x11...
The fix that Steve mentioned is to the next release of the 'libqt4-dbus' library, which you should already have installed. When this is released, an update on your machine will install the new version and with it the new 'qdbus' package, which should fix the problem.
> Tried to install qt4-x11 but the terminal says "unable to locate package qt4-x11"
You wouldn't install qt4-x11...
The fix that Steve mentioned is to the next release of the 'libqt4-dbus' library, which you should already have installed. When this is released, an update on your machine will install the new version and with it the new 'qdbus' package, which should fix the problem.