Note
This article was written for Debian and got moved to the Ubuntu group accidentally. The information may be of use though if there is an unstable branch in ubuntu.
Using the unstable branch
The unstable branch contains the newest versions of software. I've used it for packages like xmoto and virtualbox where I want the latest version.
Just add the following two lines to /etc/apt/sources.list
deb http://ftp.uwsg.indiana.edu/linux/debian/ unstable main contrib non-free deb-src http://ftp.uwsg.indiana.edu/linux/debian/ unstable main contrib non-free
You can change the mirror to something other than indiana.edu if you want. I'm not sure what they are though.
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