The latest version of vidyodesktop requires libqt4-gui, which doesn't exist in Ubuntu anymore. This always seems to be a problem with non-free software targeting multiple versions of multiple operating systems.
You can work around the issue, doing something like:
sudo dpkg -i --ignore-depends=libqt4-gui VidyoDesktopInstaller-*.deb
but then you get the dreaded unmet dependencies roadblock which prevents you from future package manager updates and operations. i.e.
You might want to run 'apt-get -f install' to correct these:
vidyodesktop : Depends: libqt4-gui (>= 4.8.1) but it is not installable
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
So what we want to do is to create a dummy Debian package that will satisfy the libqt4-gui requirement. So first off, let's uninstall vidyodesktop, and install equivs:
sudo apt-get -f install
sudo apt-get install equivs
Next, let's make a fake package:
mkdir -p ~/src/fake-libqt4-gui
cat << EOF > fake-libqt4-gui
Maintainer: Michael Davies <firstname.lastname@example.org>
Description: fake libqt4-gui to keep vidyodesktop happy
And now, let's build and install the dummy package:
sudo dpkg -i libqt4-gui_100_all.deb
And now vidyodesktop installs cleanly!
sudo dpkg -i VidyoDesktopInstaller-*.deb