Note, please replace "WWW/tools" with where ever you store your web tools.
$ mkdir ~/WWW/tools
$ cd ~/WWW/tools
$ git clone https://github.com/phacility/libphutil.git
$ git clone https://github.com/phacility/arcanist.git
This is a supplement to the official Phabricator Installation Guide, because their guide will leave you with all kinds of permission and config errors and ~15,000 setup issues on startup.
# apt-get install mercurial subversion python-pygments sendmail imagemagick