I wonder what has happened. I have Ubuntu 12.04 and Ati Radeon HD 3450 and that has supported 3D, now suddenly it does not accept my graphic-card. 

I really would like to know what to do?

Should I buy a new graphic card or is there a way to use my graphic-card on 12.10? And if so what is there a graphic-card I should buy?

My Ati is functioning with 3D, on 12.04 I don't understand why it will not upgrade to 12.10.