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This question already has an answer here:

When I try sudo apt-get install ubuntu-desktop I get the error message: unable to locate package ubuntu-desktop. Where do I obtain the package? Or what am I doing wrong?

marked as duplicate by karel, Pilot6, Zanna, Charles Green, g_p Sep 2 '17 at 16:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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The most likely situation is that you need to update your sources for some reason, with

sudo apt-get update

It's also possible that your sources aren't set up correctly. You can configure them in the update manager. They are located in the file /etc/apt/sources.list - if you continue to have problems paste the source of that file here.

  • how do I navigate to that file? Whenever I try typing /etc/apt/...I get the message - command not found. I'm a very new beginner btw. – Tom May 5 '12 at 6:04
  • gedit /etc/apt/ sources.list ;if you use ubuntu gedit installed by default – Nur May 28 '13 at 14:28
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  1. This may help you!!!
  2. Enter the following in terminal

    sudo su
    apt-get clean
    cd /var/lib/apt
    mv lists lists.old
    mkdir -p lists/partial
    apt-get clean
    apt-get update
    

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