OK, resolved by enabling Extras-Devel repository and running "apt-get -f install" from a root terminal to resolve unmet dependencies. Package qgvdial 0.5.1732 now installs without any further problems.

Next hitch is that there is no application in the master list, so cannot create Desktop shortcut. Anyone can provide the work-a-round for this kind of issue? The application does show up in the app-manager as a candidate for un-installation, if desired.
Thanks for any help that you can provide. So close and yet still so far ...