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I just installed Windows 7 on an MBR disk (SSD). I tried GPT, but there were a lot of issues. Now, I am unable to boot from Ubuntu USB in Legacy BIOS so I booted in UEFI mode.

When I am trying to install Ubuntu and select manual partition, should I install it in /dev/sda or /dev/sda1 (which is a small ext4 partition I had reserved for boot.)

I cannot designate the partition as boot, only efi boot option is available.

If I install Ubuntu to the efi boot partition , will windows keep working ?

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/dev/sda is your hard-disk /dev/sda1 is one of the partition in /dev/sda.I think it was better,if you upload gparted screenshot. –  Avinash Raj Dec 16 '13 at 9:42

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Some EFIs support switching between BIOS/CSM/legacy-mode and EFI/UEFI-mode booting in their boot managers. This is a bit awkward, because it usually requires pressing Esc or a function key during a very brief window of time early in the boot process, but it can work acceptably for some people.

If that's not an option, you might try my rEFInd boot manager. Try the USB flash drive version first; you can try it without writing anything to disk, then if it works, install it to your hard disk. You'll need to edit the refind.conf file, though: Uncomment the scanfor option and ensure that hdbios is among the options. This will tell rEFInd to scan for BIOS-mode boot options and present any that it finds on its menu. (The default on PCs is to ignore BIOS/CSM/legacy boot options.) Using rEFInd in this way works on many new PCs, but it's not guaranteed to work; some EFIs lack the necessary features, and systems with multiple hard disks don't always work correctly when booting in this way.

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Thanks for the info. I finally decided to let go of UEFI and installed everything in Legacy BIOS mode –  B J Dec 25 '13 at 7:27

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