Current documentation regarding installation of NxFilter on Ubuntu sucks.
- Fresh Ubuntu 14.04 server
- apt-get install openjdk-7-jre
- wget http://nxfilter.org/download/nxfilter-3.3.1.deb
- dpkg -i nxfilter-3.3.1.deb
- cd /nxfilter/bin
- start nxfilter
- stop nxfilter
- ./update_sh.sh
- start nxfilter
- open browser to https://[ip of nxfilter]/admin
- log in as admin:admin