I've been playing around with Apache Solr recently on my Windows box as part of a project I'm working on, and yesterday got around to the fun of trying to deploy it out on Ubuntu. There's an apt package for Solr, but unfortunately its not been updated in some time and the maintainers appear unable to work on it - so if you're using apt you're stuck with Solr 1.4. You can however install it straight onto the box. Here I'll be installing Solr 3.6 on Ubuntu 12.04.