title: Ruby RVM apt-get update error
body: <p>I get following error when trying to install anything with RVM:</p>
  
  <pre><code>Searching for binary rubies, this might take some time.
  Found remote file https://rvm.io/binaries/ubuntu/13.04/x86_64/ruby-2.1.1.tar.bz2
  Checking requirements for ubuntu.
  Installing requirements for ubuntu.
  Updating system..kshitiz password required for 'apt-get --quiet --yes update': 
  ............................
  Error running 'requirements_debian_update_system ruby-2.1.1',
  showing last 15 lines of /home/kshitiz/.rvm/log/1400047196_ruby-2.1.1/update_system.log
  ++ /scripts/functions/logging : rvm_pretty_print()  78 &gt; case "${TERM:-dumb}" in
  ++ /scripts/functions/logging : rvm_pretty_print()  81 &gt; case "$1" in
  ++ /scripts/functions/logging : rvm_pretty_print()  83 &gt; [[ -t 2 ]]
  ++ /scripts/functions/logging : rvm_pretty_print()  83 &gt; return 1
  ++ /scripts/functions/logging : rvm_error()  117 &gt; printf %b 'There has been error while updating '\''apt-get'\'', please give it some time and try again later.
  For 404 errors check your sources configured in:
      /etc/apt/sources.list
      /etc/apt/sources.list.d/*.list
  \n'
  There has been error while updating 'apt-get', please give it some time and try again later.
  For 404 errors check your sources configured in:
      /etc/apt/sources.list
      /etc/apt/sources.list.d/*.list
  
  ++ /scripts/functions/requirements/ubuntu : requirements_debian_update_system()  53 &gt; return 100
  Requirements installation failed with status: 100.
  </code></pre>
  
  <p>How can I fix this?</p>