I must say, you have 'shrunk' a lot.
Your problem with Ubuntu not installing was probably becuase you did not create space for Ubuntu. Ubuntu's installer must see either EXT4/Linux filesystem or just 'unallocated space'. Ubuntu will NOT install on NTFS.
When installing two versions of Windows, it is a good idea to install the older Windows version first, that is you did the right thing by installing Windows 7 then Win8. However, I must ask , why do you need two versions of Windows?
Anyways, to install Ubuntu and other OS, format and create your partitions on HDD in advance.
Here's what I'd do if I were you:
Code:
100GB NTFS PRIMARY Windows7 C:
100GB NTFS PRIMARY Windows8 C:
300GB NTFS PRIMARY Windows D: [for both Win7 and Win8, also this can be shared with Ubuntu]
500GB EXTENDED
25GB EXT4 LOGICAL Ubuntu / [for ubuntu system files]
25GB EXT4 LOGICAL Free
7GB SWAP
443GB EXT4 LOGICAL /home or just 'free' for linux DATA.
Install Windows FIRST. You can tell windows installer where to install each Windows.
Install Ubuntu. Use 'Something Else' option to manually guide your Ubuntu installation.
Select the first 25GB Parition, check Format, Use as= Ext4, Mountpoint=/
If you want to use the 443GB partition as /home then use Mountpoint=/home, use as=Ext4.
You can use Gparted from the Ubuntu DVD/USB to setup your partitions. When installing Windows reformat the partitions as NTFS with Windows installer, and like wise reformat EXT4 partition with Ubuntu installer.
EDIT: No you don't need UEFI.
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