From Mahara Wiki
Where to download things
|Extra Themes||Mahara Themes forum http://mahara.org/view/groupviews.php?group=40|
|Source code||See https://wiki.mahara.org/index.php/Developer_Area/Source_code|
|Latest dev build||https://github.com/MaharaProject/mahara/archive/master.zip (expect it to be unstable)|
Older versions of Mahara may be available to install as packages in Debian (and its derivatives such as Ubuntu). However, these are very old and are no longer updated by the Mahara Project.