easyprocess.EasyProcessCheckInstalledError: cmd = ['Xvfb', '-help'] OSError = [Erro 2] Nenhum arquivo ou diretório existe

Estou tentando configurar uma tela, mas está me dizendoNo such file or directory.

Traceback (most recent call last):
  File "/var/www/envs/venv/proj/scripts/my_file.py", line 44, in click
    display = Display(visible=0, size=(800,600))
  File "/usr/lib/python2.6/site-packages/pyvirtualdisplay/display.py", line 33, in __init__
    self._obj = self.display_class(
  File "/usr/lib/python2.6/site-packages/pyvirtualdisplay/display.py", line 51, in display_class
    cls.check_installed()
  File "/usr/lib/python2.6/site-packages/pyvirtualdisplay/xvfb.py", line 38, in check_installed
    ubuntu_package=PACKAGE).check_installed()
  File "/usr/lib/python2.6/site-packages/easyprocess/__init__.py", line 209, in check_installed
    raise EasyProcessCheckInstalledError(self)
easyprocess.EasyProcessCheckInstalledError: cmd=['Xvfb', '-help']
OSError=[Errno 2] No such file or directory
Program install error!

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