I have a problem when I try to download another language by the system setting menu, I have this error message :
Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/f/firefox/firefox-locale-fr_12.0+build1-0ubuntu0.12.04.1_amd64.deb 404 Not Found
I have installed Ubuntu 12.04 on an Acer C710 running Chrome OS