Instructions say:

1. Download zip file from GitHub project site: https://github.com/phpvirtualbox/phpvirtualbox/archive/master.zip
2. Unzip zipfile into /usr/share/phpvirtualbox
3. Rename config.php-example to config.php and edit as needed.
4. Move phpvirtualbox.conf into /etc/apache2/conf-available/ * NB: The default config file makes phpvirtualbox only accessible from the localhost for security reasons.

However the file "phpvirtualbox.conf" is not contained within the "master.zip" file downloaded in step #1, nor are there any files at all with the filename extension .conf contained within the zip file.