Suppose my Ubuntu version is Natty and I want to install the latest nodejs using apt-get. However, the latest nodejs is only available in the package repository of Quantal.(see http://packages.ubuntu.com/search?keywords=nodejs&searchon=names&section=all), which force me to either update my operating system to Quantal or build the latest nodejs from its source tarball.

The building script of nodejs on Natty has no difference from that on Quantal . Why the maintainers of Ubuntu package repositories don't even try to keep package repositories of Natty up with Quantal?