On Wednesday 24 August 2011 14:59:56 daniele.manghi@... wrote:
> In my sources.list, everything is a comment, except the last line :
>
> tags file:///usr/share/debtags/

i.e. you haven't got a sources.list.  apt is therefore correct in saying that 
you have not got a particular package.  You haven't got any!

What distro have you installed and how?  It rather looks as though you have 
got Ubuntu of some sort or other, but how did you install it?  I have never 
come across a Ubuntu installation (nor indeed any other) that was installed 
with _no_ repositories.

Dr. Klepp is right, if you have Ubuntu with GNOME you can set repositories up 
in Synaptic quite simply.

In fact, there may be a simple way anyway.  Could you post the whole of your 
sources.list, including the lines commented out?

Lisi