Parental Control in Ubuntu 14.04

There are some good solutions for doing Parental Control in Ubuntu 14.04. One is SelfControl which is a fork from the Mac OSX version (installation instructions). But, one of the SelfControl's shortfall is that It only does the web content filtering, and without a scheduling functionality (It only allows you to block a certain website in an amount of time). Luckily, there is another Parental Control software for Linux called gnome-nanny. Beside web content filtering, gnome-nanny also helps you to control the PC, mail client, and Intant messaging use time:

To install gnome-nanny in Ubuntu 14.04:

$ sudo add-apt-repository ppa:boamaod/nanny-test
$ sudo apt-get update
$ sudo apt-get install nanny