Deleting GRUB2 which is placed in sda? And how to fix two Ubuntu entry in EFI Boot selector?

I have EFI Windows 8 in my Asus K55V laptop. EFI partition is sda1.

I tried to install Ubuntu in EFI mode and created/selected separate boot partition for Ubuntu boot loader.

Ubuntu installed perfectly, but I got 2 boot entries in EFI setup. When I tried to delete it in EFI setup (bios screen), it restored on restart.

So I tried doing boot-repair from live-usb, the thing is it added GRUB2 to my sda partition. And it did not solve the 2 Ubuntu boot entries. So I deleted the Ubuntu partitions (boot/swap/mount) to remove Ubuntu from my laptop.

Now the problem is that GRUB2 which is in sda is listed in EFI Boot selector (without Ubuntu actually installed).

Check this http://paste.ubuntu.com/1554147/

I need two solutions:

1. How do I remove GRUB2 from sda partition?



2. How to install Ubuntu without getting 2 boot entries? Should I
   select the sda1 (EFI partition) as boot loader partition when
   installing Ubuntu?