title: python program not working apt-get install xvfb
body: <p>i'm trying to run a program that i downloaded but it isn't working
  pycharm returns the following</p>
  
  <pre><code>-----------------------------------------------------------------------------
  Traceback (most recent call last):
    File "fb-hfc.py", line 291, in &lt;module&gt;
      display = Display(visible=0, size=(1600, 900))
    File "/home/apple/.local/lib/python2.7/site-    packages/pyvirtualdisplay/display.py", line 33, in __init__
      self._obj = self.display_class(
    File "/home/apple/.local/lib/python2.7/site-    packages/pyvirtualdisplay/display.py", line 51, in display_class
      cls.check_installed()
    File "/home/apple/.local/lib/python2.7/site-    packages/pyvirtualdisplay/xvfb.py", line 38, in check_installed
      ubuntu_package=PACKAGE).check_installed()
    File "/home/apple/.local/lib/python2.7/site-    packages/easyprocess/__init__.py", line 180, in check_installed
      raise EasyProcessCheckInstalledError(self)
  easyprocess.EasyProcessCheckInstalledError: cmd=['Xvfb', '-help']
  OSError=[Errno 2] No such file or directory
  Program install error! 
  You can install it in terminal:
  sudo apt-get install xvfb
  </code></pre>
  
  <p>running apt-get install xvfb doesn't help</p>
  
  <p>the app is fb-hfc google it you'll find it if its code help</p>