This is the first time I'm using Ubuntu. My knowledge about Linux is almost nothing. I installed Ubuntu 12.10 from windows 7 (dual boot) but I think it didn't install my graphics (ATI Radeon HD 4670) driver because in the System Settings > Details, it says Graphics Unknown. So I install the AMD Catalyst Legacy (fglrx-legacy) but it doesn't work. I had a problem with the resolution. Then I remove it and back to normal. I also tried xorg-edgers. This time I'm stuck at the purple screen after reboot. Then I recover using the GRUB menu, remove xorg-edgers, and it back to normal again. Is there any way to install it?