System: 2009 Dell Inspiron 537s(slim), Core Duo E8400(3.3GHz OC), 4GB, WD 320GB HD, Radeon HD6450 graphic, Dual boot:Vista/Ubuntu12.04LTS

Noob Question#1: Got the new graphic card 2 weeks a ago. Has a driver CD, but said: Only for Windows!
I know I could put the CD in Windows (Vista). (Not yet though.)

But in boot time, Ubuntu, my display stopped dead, have to start boot with Linux 'Recover Mode'......

Do I have to get a Radeon driver in a Ubuntu version? In or someplace else?
(Vista starts fine any time.)