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I am a new ubuntu user. when I run sudo apt-get update this error message appears:

W: Failed to fetch  404  Not Found

What to do now ?

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marked as duplicate by Lucio, karel, Eric Carvalho, Rinzwind, waltinator May 10 '14 at 4:08

This question was marked as an exact duplicate of an existing question.

What command did you used to update? Please, past the full output. Have you checked the internet connection? – Lucio May 9 '14 at 3:19
Raring has reached End-Of-Life, and its packages aren't (or shouldn't be) available in the regular repos. You will need to upgrade to Saucy (13.10) or Trusty (14.04) for updates and support. – saiarcot895 May 9 '14 at 3:22

If the 404 error was due to an additional repository that has been added to /etc/apt/sources.list then its easier to add # character to the start of the line to comment out the offending repository i.e.

  1. Install gksu first

    sudo apt-get install gksu

  2. Open /etc/apt/sources.list as Root

    gksu gedit /etc/apt/sources.list

  3. Go to line 52-53, add # character to the start line 52-53 like mine source list

  4. Save it, done !

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I think the repository "extra" not longer supported for version 13.04. I solve the problem commenting the line. Using a VM with version 14.04 Extra repository works.

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
#deb raring main
#deb-src raring main
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