[ubuntu] removed driver ati opensource by Synaptic now it wont boot

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http://ubuntuforums.org – Hey guys I uncheck all the unrelated ati because i ended up having ati driver installed plus opensource so I went through synaptic and removed all the ati related. LOL now I cant boot. I missed up and I'm no expert. How can I install the opensource driver? I have a ATI Radeon™ HD 4250 built into my laptop and also I'm on ubuntu 10.10 with latest kernel. Thanks guys. Sorry for my dumb self screwing up. I just thought that if i uninstall from synaptic maybe i could install ati driver now i just want to stay on opensource. I guess i need to uninstall the ati driver too so. Can someone help me wi (Hardware)