Gnome-Schedule – GNOME scheduler for automatic tasks
Supports custom titles and icons for your tasks so that they are more easily to keep track of
Templates support so that you won't have to create the same task again and again; these are saved in gconf and may easily ship them with, say, a Linux distribution
If run as root, you can edit any user's crontab and "at" tasks.
Human-readable strings like "Every hour" instead of "0 * * * *"
Advanced mode for crontab experts
Provides a "panel applet" where you can manage tasks from a dropdown menu
Predefined common expressions like: every minute, every week, tomorrow, next week
A calendar allows you to choose the day you want a task executed
Install gnome-schedule in ubuntu
Open the terminal and run the following command
sudo apt-get install gnome-schedule