I have an ASUS K56CM which I installed Ubuntu 12.04 on, but it kept freezing so I upgraded to 14.04 but somewhere during the install the driver for my Nvidia graphics card was corrupted and now when I boot to Ubuntu I get a black screen with a flashing cursor.
I have tried to boot from a USB to do a fresh install of 13.10 but I cant seem to get it to work.
I have formatted the usb with UUI and hold F12 on boot like before but it doesn't work. What am I doing wrong?
Also when I start up my device I still have the option to boot windows 8 which runs fine.
I have tried refreshing and reinstalling windows 8 so I can start over but it says I am missing an important partition or do not have the permissions to do this.
What is the best way to get my device running on Ubuntu again?
Thank you for all your help.