Quote Originally Posted by aysiu View Post
Okay. The problem is you're running Ubuntu 8.04 (Hardy Heron), but your repositories are mainly for Ubuntu 7.10 (Gutsy Gibbon).

So let's get you a fresh repositories list and try again.

Let's save the old list somewhere:
sudo mv /etc/apt/sources.list
and create a new list
gksudo gedit /etc/apt/sources.list
In the new text editor window, paste in
deb http://archive.canonical.com/ubuntu hardy partner

deb http://br.archive.ubuntu.com/ubuntu/ hardy main universe restricted multiverse
deb http://security.ubuntu.com/ubuntu/ hardy-security universe main multiverse restricted
deb http://br.archive.ubuntu.com/ubuntu/ hardy-updates universe main multiverse restricted

deb http://packages.medibuntu.org/ hardy free non-free
then save the file and exit the text editor.
sudo apt-get update
sudo apt-get install firefox-2

it worked!

I do recognize your help. thanks a milion for the support!!!!