The firefox-stable ppa is only available for Maverick and Lucid users. If you are using Natty or Oneiric, then the first ppa won't work, since those Ubuntu versions are already following the fast release cycle and don't need that ppa.
If you can't wait for Firefox 9, you can use the fourth ppa in the list, which is ubuntu-mozilla-security. This one will provide Firefox 9, which is currently under testing before being provided by the official repos.




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