In the rush to a new release, the GNUe Developers may post pre-release versions or release candidates for people to download and try to break. Anyone is welcome to try the pre-releases - any problems should normally be reported via the IRC channel. However, if you want something a bit more stable, you might prefer to try the current releases.
For Debian and Debian based GNU/Linux distributions (like Ubuntu), you can add these lines to your /etc/apt/sources.list to be able to install the latest prerelease version of GNU Enterprise with your favourite package manager (apt-get, aptitude, synaptic, or adept):
deb http://www.gnuenterprise.org/downloads current/ deb http://www.gnuenterprise.org/downloads prereleases/