Mabe this is too late to help but I had the same problem. My fix was to launch Synaptic Package Manager and do a search for Zenity. When I found the package had been installed I marked it for removal. After that i could open terminal and sudo pppoeconf, entered my password and it configured my DSL connection without a hitch.
Mabe this is too late to help but I had the same problem. My fix was to launch Synaptic Package Manager and do a search for Zenity. When I found the package had been installed I marked it for removal. After that i could open terminal and sudo pppoeconf, entered my password and it configured my DSL connection without a hitch.