I have downloads Phabricator on my Ubuntu server, using nginx. When I try to load it on the browser, this error is shown:

"Unable to load libphutil. Put libphutil/ next to phabricator/, or update your PHP 'include_path' to include the parent directory of libphutil/."

Then, I moved libphutil to the same folder as phabricator (it was inside phabricator), and now this error is shown:

"[Core Exception/PhutilBootloaderException] Include of 'arcanist/src/__phutil_library_init__.php' failed!"

What gives? How can I fix it?