I have Ubuntu 11.10 and would like to go online with an external modem. I have some downloaded packages, gnome ppp & wvdial on my desktop but have not been able to install them. They do open in the software center but the install button isn't active. Also tried to use terminal and got "dpkg: command not found" Is there a simple way to get this installed? Once I have gnome ppp installed I should be able to go online and use the software center.