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:
Code:
sudo mv /etc/apt/sources.list
and create a new list
Code:
gksudo gedit /etc/apt/sources.list
In the new text editor window, paste in
Code:
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.
Code:
sudo apt-get update
sudo apt-get install firefox-2
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