You can install it by downloading from SourceForge using the commands below:

cd
mkdir source
cd source
wget http://softlayer.dl.sourceforge.net/sourceforge/hydrogen/hydrogen_0.9.4rc1_i386.intrepid.deb
dpkg -i hydrogen_0.9.4rc1_i386.intrepid.deb


Of note, is more use of Qt4 elements with less eye candy on the skins, and questionably easier to interpret. I kind of feel it clashes, but the Instrument and drum kit editor have been combined. It means one less place to find things, and that is progress.

Hydrogen drum computer software running on Ubuntu Linux