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 work:

  sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0C713DA6

• Finally we install Firefox-3.5 by running following command:

  sudo apt-get install firefox-3.5

• Addicionally you can change the symbolic link at /usr/bin/firefox to refer to /usr/bin/firefox-3.5

That’s it!! Enjoy!

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