When I type the command sudo tasksel I get a list of server packages I can install. I only have basic Ubuntu server installed at moment. My version is 12.04. When I select for example samba file server and OK it I get an error.
tasksel: aptitude failed (100).
I also get errors trying to
sudo apt-get install ubuntu-desktop. (unable to locate package)
I can ping Google and other site and I do seem to have Internet connectivity. Please help.