== Create database ==

sudo omindex --db /var/lib/xapian-omega/data/default --url / /var/www

== Test it ==

Check in commandline with:
/usr/lib/cgi-bin/omega/omega 'P=linux' HITSPERPAGE=10

== Configure Apache ==

Make sure that /search is disabled for RewriteCond in your vhosts.d
conf and then add:

ScriptAlias /search /usr/lib/cgi-bin/omega/omega