I cannot install AC on Ubuntu 12.10

[dumbass]

I downloaded AC and run this in terminal:

[SELECT ALL] Code:

sudo apt-get install libsdl1.2debian-all libsdl-image1.2 libsdl-ttf2.0-0 libopenal1

But libsdl1.2debian-all "doesn't have a candidate for install". Without it I cannot launch AC. Any idea how to install it? Sorry for my dumb question.