I installed Cairo Dock to try it, but I did not liked it. But uninstalling in the Software Center did not work, because the Cairo Dock is still sticking at the bottom of my screen. Here on askubuntu.com i found many answers and i tried nearly all of them, but i still see the Cairo Dock down there at my screen, and often the terminal said that "cairo-dock" is not installed or similar errors.
Please help me, because the this dock is a very annoying thing on my screen.
Solved.
killall cairo-dock
should do it.