Try Out Ubuntu Hardy Heron (8.04)

For those ubuntu freaks out there, you can already try out the new version of Ubuntu 8.04, see if there are new features and changes. But remember it’s still far from being the final version (let’s wait little less than six months). It may have some bugs, and it’s normal, for a under development OS.

So If you really want to try it, here is how you can do it:

$ sudo vi /etc/apt/sources.list # in the end place :%s/gutsy/hardy and press enter

If you are using the graphic interface, use ALT + F2

gksu gedit /etc/apt/sources.list

Go to, Search -> Replace, and in the first line you can put Gutsy and in the second Hardy, and set to replace, save and close the file.
Now you can:

$ sudo apt-get update && sudo apt-get dist-upgrade

$ sudo shutdown -r now

Here we go gentleman!

[Via]