Blender is a perfect piece of software with many brillian changes in each minor release. But often most recent versions of ubuntu does not have latest versions of blender.
So here is a relatively simple way of having latest version of blender in your ubuntu distribution.
1) visit http://www.blender.org/ and find appropriate version of latest blender package (64bit or 32bit for linux) in download section and save it somewhere on your filesystem.
2) I assume that it's not a problem for you to have two additional items in your home directory.
3) Add item to the menu:
Then edit with your favorite editor
Don't forget to change
4) When new version of blender will be released all you have to do is to download it, extract and renew symlink
I suggest you add this blender ppa as follows:
From now on, any updates to the ppa should be offered automatically.