I'm trying to install ubuntu 12.10 on a sony vaio that runs windows 8 natively.
After booting from cd I arrive at the point where I have to choose the partition:
First of all, I come to a page where it tell me to scroll a bar to choose how much space I want to dedicate to ubuntu (like this (not my case)); but it shows me a partition of something like 30 GB.
So I decided to go for the advanced one.
The partition that I expected to use is the sda5, type:ntfs, and 718 GB wide. Under the flag "used" there's the word "unknown".
I was not able to modify/divide that in any way. I also tried to run gparted live cd to divide it manually but I couldn't boot it because of a "safe boot error".
What I am doing wrong?