MapR has posted all of its Hadoop ecosystem source code to Github: MapR Technologies.
MapR has also partnered with Canonical to release the entire Hadoop stack for 12.04 LTS and 12.10 releases of Ubuntu on www.ubuntu.com starting April 25, 2013.
For details see: MapR Teams with Canonical to Deliver Hadoop on Ubuntu.
I first saw this at: MapR Turns to Ubuntu in Bid to Increase Footprint by Isaac Lopez.