Unhandled exception (982d20e6)

Zeus version:
`1.5.2.21b875`

Firefox version:
`failed to start`

Geckodriver version:
`geckodriver-v0.19.0-linux64.tar.gz`

Error info:
```Traceback (most recent call last):
File "/home/dan5/.virtualenvs/zeus-scanner-git/var/search/selenium_search.py", line 268, in parse_search_results
tor=tor, batch=batch, xforward=forward_for
File "/home/dan5/.virtualenvs/zeus-scanner-git/var/search/selenium_search.py", line 80, in get_urls
ff_display = Display(visible=0, size=(800, 600))
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/display.py", line 34, in __init__
self._obj = self.display_class(
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/display.py", line 52, in display_class
cls.check_installed()
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/xvfb.py", line 38, in check_installed
ubuntu_package=PACKAGE).check_installed()
TypeError: __init__() got an unexpected keyword argument 'url'
```

Running details:
`Linux-5.4.0-48-generic-x86_64-with-Ubuntu-20.04-focal`

Commands used:
`zeus.py -d http://imced.edu.mx`

Log file info:
```2020-10-05 19:44:49,599;zeus-log;INFO;log file being saved to '/home/dan5/.virtualenvs/zeus-scanner-git/log/zeus-log-15.log'
2020-10-05 19:44:49,600;zeus-log;INFO;using default search engine
2020-10-05 19:44:49,600;zeus-log;INFO;starting dork scan with query 'http://imced.edu.mx'
2020-10-05 19:44:49,600;zeus-log;WARNING;will not parse webcache URL's (to parse webcache pass -W)
2020-10-05 19:44:49,600;zeus-log;WARNING;only pulling URLs with GET(query) parameters (to pull all URL's pass -E)
2020-10-05 19:44:49,601;zeus-log;INFO;attempting to gather query URL
2020-10-05 19:44:49,601;zeus-log;INFO;setting up virtual display to hide the browser
2020-10-05 19:44:49,602;zeus-log;ERROR;selenium_search.pyc failed to gather the URL from search engine, caught exception '__init__() got an unexpected keyword argument 'url'' exception has been logged to current log file
Traceback (most recent call last):
File "/home/dan5/.virtualenvs/zeus-scanner-git/var/search/selenium_search.py", line 268, in parse_search_results
tor=tor, batch=batch, xforward=forward_for
File "/home/dan5/.virtualenvs/zeus-scanner-git/var/search/selenium_search.py", line 80, in get_urls
ff_display = Display(visible=0, size=(800, 600))
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/display.py", line 34, in __init__
self._obj = self.display_class(
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/display.py", line 52, in display_class
cls.check_installed()
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/xvfb.py", line 38, in check_installed
ubuntu_package=PACKAGE).check_installed()
TypeError: __init__() got an unexpected keyword argument 'url'

2020-10-05 19:45:25,239;zeus-log;INFO;Zeus got an unexpected error and will automatically create an issue for this error, please wait
2020-10-05 19:45:25,240;zeus-log;INFO;getting authorization
2020-10-05 19:45:25,249;zeus-log;INFO;extracting traceback from log file
2020-10-05 19:45:25,250;zeus-log;INFO;attempting to get firefox browser version
2020-10-05 19:45:25,257;zeus-log;ERROR;failed to run firefox
```

Start with var/search/selenium_search.py at lines 80 and 268, then inspect the installed pyvirtualdisplay and Xvfb dependency versions on Ubuntu 20.04. Reproduce with `zeus.py -d http://imced.edu.mx` and verify that search URL gathering no longer fails with the unexpected `url` argument error.

Written by the indexing model from the issue text.