I have found the source of the problem. the solution was found here: http://ubuntuforums.org/showthread.php?t=2109438
It seems that for HDDs larger than 2TB, they need to be explicitly set to Partition table of GPT, and the current installer isn't able to do this as well as not being able to setup the necessary partition of at least 1.0MB with the flag 'biosgrub' I had to use GParted (I used GParted Live CD) to set up the Partitions and the 1.0 Partition with no file system and the flag set to 'biosgrub' and then used the 12.04.3 Installer and it worked fine. Once you get to the partitioner part, the necessary partitions are already set and you just do the RAID configuration, add the swap and main partitions to the array, and set them up as - swap area, and ext4-mount point /(root) respectively. No need for bootable flags. Installer installs grub fine and all joy. None of the tutorials hit this snag as they all use Virtual machines with very small partitions. Not sure whether this would still be classed as a bug Maybe worth a mention in the Official Documents? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1267093 Title: Manual Partitioning unable to set Bootable flag to on. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/1267093/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
