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=== older releases repositories gone or missing ===Error us.archive.ubuntu.com:http' (-5 - No address associated with hostname) Try changing to the following in /etc/apt/sources.list deb http://archive.ubuntu.com/ubuntu/ precise main restricted #deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted deb-src http://archive.ubuntu.com/ubuntu/ precise main restricted #deb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted