Not in 2017. In 2014. You're using Ubuntu 14, which means you get 2014 versions.
* http://packages.ubuntu.com/trusty/nodejs
* http://packages.ubuntu.com/xenial/nodejs
* http://packages.ubuntu.com/yakkety/nodejs
* http://packages.ubuntu.com/zesty/nodejs
Not in 2017. In 2014. You're using Ubuntu 14, which means you get 2014 versions.