Ubuntu users can add the following two lines in /etc/apt/sources.list
and use Ubuntus own package management tools apt-get, aptitude, etc.
Replace intrepid with your version of Ubuntu. Use 
  grep CODENAME /etc/lsb-release
to determine your Ubuntu release.

deb http://ftp.indexdata.dk/ubuntu intrepid main
deb-src http://ftp.indexdata.dk/ubuntu intrepid main

These packages are signed with a key you can install as follows:
 wget http://ftp.indexdata.dk/debian/indexdata.asc
 sudo apt-key add indexdata.asc