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In an attempt to fix the problem, I uninstalled lightdm and gdm is now the default. But I experience the same problem with gdm. When I try to reinstall lighten, I receive:

WARNING: The following packages cannot be authenticated! 
lightdm
Install these packages without verification [y/N]? y
Err http://us.archive.Ubuntu.com/ubuntu/ raring-updatea/main lighten amd64 1.6.0-ubuntu3
Something wicked happen ed resolving 'us.archive.ubuntu.com:http' (-11 - System error)
Failed to fetch http://us.archive.ubuntu.com/Ubuntu/pool/main/1/lightdm_1.6.0-0ubuntu3_amd64.deb So me thing wicked happened resolving 'us.archive.ubuntu.com:http' (-11 - System error)
E: Unable to fetch some archives, maybe run apt-get update or try with --fix missing?
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1 Answer

There is error in URL in your /etc/apt/sources.list:

  1. Run sudo nano /etc/apt/sources.list,

  2. Find text

    http://us.archive.Ubuntu.com/ubuntu/ raring-updatea/main

    And replace it with

    http://us.archive.Ubuntu.com/ubuntu/ raring-updates/main

  3. Run

     sudo apt-get update
     sudo apt-get upgrade
    
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When I turned on my PC, all issues were resolved. Weird. –  JasonO Sep 8 '13 at 17:15
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