What is the best way to get the latest version of mono on ubuntu?
Not sure it's the best option, but i use the repository of badgerports
badgerports is a software repository for use with Ubuntu Linux 10.04. Whilst on the whole it is a good idea to use the software provided with your Linux distribution, there are sometimes bugs or major software updates that cannot be included for operational reasons. badgerports is a home for a number of wayward software packages, to enhance the Ubuntu experience.
The primary purpose of badgerports is to provide recent versions of the Mono framework, and associated packages such as F-Spot, Banshee, and Monodevelop. Suggestions for other packages to include are welcome, but don't be offended if I decline for whatever reason.whatever reason.
You can find the instructions on how to use it here