Attaching a couple of screenshots to better explain.
So in the 1st screen, I can't click anything. New partition table is disabled, so are the rest of the buttons. Clicking install, results in an error.
In the 2nd screen you can see that I don't have any option to set a mount point for my newly created partition. Also if I use GParted to create my partitions, the installer doesn't see any of them.
Any ideas how I can install Ubuntu? I had no problems installing it on a different machine. Also I think the HDD was running a windows before without any problems.
Updated the questions with the result of
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 / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000914db Device Boot Start End Blocks Id System /dev/sda1 2048 1953523711 976760832 83 Linux