Whenever I try to update my computer using the Update Manager or sudo apt-get update on a terminal I get this:

Failed to download the information from the repository

Check your Internet connection    

Details:    

 `W:Failed to fetch gzip:/var/lib/apt/lists/partial/ar.archive.ubuntu.com_ubuntu_dists_oneiric_unive‌rse_i18n_Translation-en`     

  Encountered a section with no Package: header , E:Some index files

  failed to download. They have been ignored, or old ones used instead.

But my Internet connection works fine.

The banish404 software doesn't work. Here is my /etc/apt/sources.list file.

What do I have to do?