Same issue.
1. Are you trying to install Oxwall locally or on server?
Locally, Ubuntu Studio 12.10 & 13.04
2. If on server, can you make sure that your server meets our requirements listed here:
http://www.oxwall.org/hosting
apache 2.2.22, PHP 5.4.9, mysql 5.5.34, mysqli, curl, perl, mcrypt,
geoip, ffmpeg, imagick extensions in addition to what is listed there.
3. Can you send a screen shot of the error?
http://i.imgur.com/Nr8TWHd.png
4. Make sure that mod_rewrite is installed and set correctly on your server.
mod_rewrite enabled and checked. can you provide more verbose details for "correctly"?