1.Press 'e' at the bootloader to enter the bootloader and press 'e' again to enter the kernel options and add nomodeset rdblacklist=nouveau and boot the system. After you install the system download proper driver for your card, chmod +x _name_of_your_driver.run and type init 3 in terminal to enter runlevel 3. Login as root, and run the installer. If you have any issues you want to update the kernel http://www.wikihow.com/Update-Ubuntu-Kernel
2.Adding How do I set 'nomodeset' after I've already installed Ubuntu? as a reference for more details. Basically, hit e at the grub boot selection to modify how that entry boots and add nomodeset rdblacklist=nouveau to the line that starts with linux and probably includes the word splash. Make sure you add it before the ---.