Comment 2 for bug 1247653

(1TB in a machine with a EFI BIOS capable, but disabled, working in the normal mode or legacy mode - I am not sure about the correct term to describe a EFI BIOS that can boot unsigned OS)

problem 1: It is unable to detect my windows 7 64 bits installation. As result, it deleted my previous windows installation and erased completely the partition table.
Even if you choose manual partitioning it will ignore the allocation for the several mount points (/boot, / and swap) and it will erase the previous partition table and create a new one.

This disk used to have a Windows 7 64 bits installed in the primary partition 1 and 2 and Ubuntu 13.04 using the primary partition 3 as /boot, and partition 5 for / and partition 6 for swap.
I was unable to upgrade from 13.04 to 13.10 using the update-manager tool, due to broken packages. I was upgrading from one version to the next since 12.04 and I thought that instead fixing the broken packages, it was better to make a clean install using a ubuntu 13.10 live cd running in a usb-flash.
The installer didn't recongnized the Windows and I didn't notice this during the installation setup.

After the first boot I realized the windows was gone and Ubuntu installted itself in the whole disk which is now,GPT type.
Next time I re-installed the Windows, used gparted to re-size the windows partition, creating manually partions for /boot, / and swap and during the install I associated manually the mount points to the correspondent entries in partition table. Note that again, Ubuntu didn't detect the Windows and didn't give an option to install Ubundu side-by-side.
Again, Ubuntu installed itseld in the whole disk, erasing the assigned partition table.

problem 2:
Next I used the program gdisk (expert mode/zap ) to remove the GPT signature and using fdisk , create a empty msdos table.
Again, I re-install Windows 7 first, re-size the disk to leave space to Ubuntu and this time Ubuntu installer recognized the Windows and gave an option to install Ubuntuu side-by-side.

At the end of installation grub menu was there and both Windows and Linux are avaiable to boot. Choosing Windows was ok, but choosing Ubuntu, I got the message, after a long while:

ALERT! /dev/disk/by-uuid/xxx.....xxxx does not exist.

Dropping to a shell!
BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs)

Finally, I install Ubuntu 12.04 from an old image I had (which worked right way) then I upgrade it to 13.04 and then to 13.10 ! A lot of work, isn't ?
Currently I am running Ubuntu 13.10 side-by-side with Windows 7, but it was not easy !