I have been unable to get Riak working under Ubuntu 9 due to many problems. I tried following the current blog:
http://onerlang.blogspot.com/2009/10/fighting-with-riak.html
: but still Riak is not working. Has anyone else had problems with Riak on Ubuntu 9?
I did get this working eventually by following this guide:
http://megam.info/2010/01/20/riak-strapping-up/
Also I have written my own guide on this as well:
http://riak1.blogspot.com/2010/02/how-do-i-install-riak-on-ubuntu-9.html