Install x-tile in ubuntu
First you need to download .deb package from here or using the following command
Now install this .deb package by double clicking or from the terminal run the following command
sudo dpkg -i x-tile_1.3.1-1_all.deb
Add to the gnome panel
right click upon a panel and select "add to panel...", then select "x tile"
from the list and click "add"
For more details check here