title: Error installing with pip
body: <p>Trying to uninstall a package installed with pip, I uninstall some and now pip don't work. I try to install pandas:</p>
  
  <pre><code>[sudo] pip install pandas
  </code></pre>
  
  <p>And this is the error:</p>
  
  <pre><code>Requirement already satisfied (use --upgrade to upgrade): pandas in /usr/lib/python2.7/dist-packages
  Requirement already satisfied (use --upgrade to upgrade): python-dateutil in /usr/local/lib/python2.7/dist-packages (from pandas)
  Downloading/unpacking pytz (from pandas)
  Downloading pytz-2013b.zip (535kB): 535kB downloaded
  Running setup.py egg_info for package pytz
  /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'zip_safe'
    warnings.warn(msg)
  usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
     or: -c --help [cmd1 cmd2 ...]
     or: -c --help-commands
     or: -c cmd --help
  
  error: invalid command 'egg_info'
  Complete output from command python setup.py egg_info:
  /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'zip_safe'
  
  warnings.warn(msg)
  
  usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
  
   or: -c --help [cmd1 cmd2 ...]
  
   or: -c --help-commands
  
   or: -c cmd --help
  
  error: invalid command 'egg_info'
  
  ----------------------------------------
  Command python setup.py egg_info failed with error code 1 in /tmp/pip-build-root/pytz
  Storing complete log in /root/.pip/pip.log
  </code></pre>
  
  <p>I have Linux Mint Mate 15. How I can resolve this??</p>