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ubuntu@ubuntu:~$ sudo fdisk -lu

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xd033d792

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2          206848   986601471   493197312    7  HPFS/NTFS/exFAT
/dev/sda3       986601472  1953519615   483459072    7  HPFS/NTFS/exFAT


/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 -- possibly by a program that doesn't understand GPT partition tables.  
Or perhaps you deleted the GPT table, and are now using an msdos partition table.  
Is this a GPT partition table?

So when I try to install ubuntu I get a whole TB of unallocated disk. However I can see the 2 partitions mounted on ubuntu when I run "try ubuntu" I've created the ntfs partition on /dev/sda3 in an effort to fix the GUID table without success.

Is there any way to fix this so I can install ubuntu on /dev/sda3?

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Still affected by this issue? –  Braiam Feb 7 at 2:16
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