As my laptop is a bit old I'm trying to boot 12.10 from a USB stick using Plop. I saved the image to the stick using UNetbootin.
I have to use nolapic option when booting any linux compilation I've tried and so I did for 12.10. When it finishes booting I get to an empty screen with just the background and mouse arrow but no top or unity bar. Surprisingly I get a popup notification about available wireless connection. Right click has no effect, but I can hit CTRL+Alt+Supr and I get the window asking if I want to logout or cancel. If I logout I get to the login screen and now I can see the top bar with icons, clock, net, etc. I also can see the login box, and connect to my wireless typing the password.
If I try to login using "ubuntu" as user and no password I get to the same empty screen as before.
Besides that, if I try to install, the process stalls when I hit continue at the screen where it checks if you have internet connection, 4.8GB of free space, and the laptop is plugged. I can see the top bar there.