In order to install Firefox 3.5 in Ubuntu (before Canonical update the official repositories) is as follows:

First you should add following line in /etc/apt/sources.list (in order to edit this file you will need admin privileges, aka run as root):
deb http://ppa.launchpad.net/fta/ppa/ubuntu jaunty main

Then, we should run following command to validate previous repository and make apt-get to [...]

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firefox, ubuntu