title: How do I install ruby 2.0.0 correctly on Ubuntu 12.04?
body: <p>I have successfully installed <code>rvm</code>, but when I run the following commands</p>
  
  <pre><code>sudo apt-get update
  </code></pre>
  
  <p>Or:</p>
  
  <pre><code>rvm install 2.0.0
  </code></pre>
  
  <p>I have the following errors:</p>
  
  <pre><code>W: Failed to fetch http://ppa.launchpad.net/cheleb/blender-svn/ubuntu/dists/precise/main/source/Sources  404  Not Found
  
  W: Failed to fetch http://ppa.launchpad.net/cheleb/blender-svn/ubuntu/dists/precise/main/binary-amd64/Packages  404  Not Found
  
  W: Failed to fetch http://ppa.launchpad.net/cheleb/blender-svn/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found
  
  W: Failed to fetch http://ppa.launchpad.net/ferramroberto/oneiric/ubuntu/dists/precise/main/source/Sources  404  Not Found
  
  W: Failed to fetch http://ppa.launchpad.net/ferramroberto/oneiric/ubuntu/dists/precise/main/binary-amd64/Packages  404  Not Found
  
  W: Failed to fetch http://ppa.launchpad.net/ferramroberto/oneiric/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found
  </code></pre>
  
  <p>How can I fix these errors?</p>