I have a 2 TB hard disk. I have installed Windows 8 in 200 GB space, and leave more 800 GB for it, formatted as NTFS.
My idea was to install the Ubuntu 13.04 in the left 1 TB.
The issue is that the Ubuntu installer is showing to me a 2 TB free space – it is not detecting that the hard drive has been already partitioned.
What should I do in order to achieve my goal and have Ubuntu 13.04 and Windows 8?
I have follow the advice below and open gparted in "try Ubuntu" mode. It gives me the following question with 'yes/no' options:
/dev/sda contains GPT signatures indicating that it has a GPT table. However, it does not have a valid fake msdos partition table, as it should. Perhaps it was corrupted - possible by a program that doesn't understand GPT partition tables. Or perhaps, you deleted the GPT table, and are now using un msdos partition table. Is this a GPT partion table?