[ubuntu] 401 Authentication Error When Install/updating Software

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http://ubuntuforums.org – When running apt-get install | update (or update-manager) I get Authentication Errors for multiple packages. Following is an example trying to install openssh-server: Code: $ sudo apt-get install openssh-server Reading package lists... Done Building dependency tree      Reading state information... Done The following extra packages will be installed:   ssh-import-id Suggested packages:   rssh molly-guard openssh-blacklist openssh-blacklist-extra monkeysphere The following NEW packages will be installed:   openssh-server ssh-import-id 0 upgraded, 2 newly i (Hardware)