Trying to install Ubuntu 13.10 (x64 package) on a HP Probook 4430S from USB made with UnetBootin.

Intel Celeron B810 Dual-core x64 1.6ghz

4gb Ram

Intel Graphics HD 2000

320GB HDD - 3 partitions (1 with backup files - 40gb, 2 Win7 that were dual-boot but no longer boot after attempting to install - 55gb and 222gb)

I am fine with losing the data on the 222gb partition, but when trying to install it only shows the 55gb and the 222gb, but the 222gb is not 222gb...its including the 40gb backup. Whatever, went through with the installation anyway. Files can be replaced (just backed-up games anyway.)

Installation appears to run without a hitch on the now 222gb/262gb partition, formatted to ext4 with the installer itself. Asks to reboot to begin using.

Upon rebooting, I get the GNU boot selection screen. Press Enter on "Ubuntu". Get a "Gave up booting from root..." or something error.

Reboot and load "Try without installing" option from USB. Once booted, nothing has changed! All 3 partitions are still present, all files intact. But now I can't boot my Win7 55gb partition.

EVERYTHING in the "Try..." loader works perfectly. Bluetooth, Wifi, Display adapter, SD Card reader, HDMI-Out, DVD drive, USB ports...even reads correct battery data.

Help?