Timekpr – Keep control of computer usage
The application works as a parental time control, and will be useful to parents who want to limit child access time.
Install Timekpr on ubuntu 14.04
Open the terminal and run the following commands
sudo apt-add-repository ppa:mjasnik/ppa
sudo apt-get update
sudo apt-get install timekpr
After installation you need to logout and login bac to see the changes