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I'm using a dual boot with Ubuntu 16 and Windows 10. I've installed Windows first and then when installing Ubuntu I mistakenly installed grub into Windows "System Reserved" partition. As a result, I couldn't boot Windows.

Then I've run https://help.ubuntu.com/community/Boot-Repair tool and it resolved an issue.

However the grub now shows 2 windows loaders at boot screen. One of them boots Windows successfully and another one opens the grub itself again (circular menu item). So I would like to get rid from the second one as it's useless now.

Here's what sudo update-grub returns:

Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.8.0-36-generic
Found initrd image: /boot/initrd.img-4.8.0-36-generic
Found Windows 10 (loader) on /dev/sda1
Found Windows 10 (loader) on /dev/sda2
Found linux image: /boot/vmlinuz-4.8.0-36-generic
Found initrd image: /boot/initrd.img-4.8.0-36-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
Found Windows 10 (loader) on /dev/sda1
Found Windows 10 (loader) on /dev/sda2
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin



Boot Info Script shows the following info:

                  Boot Info Script 0.61      [1 April 2012]

============================= Boot Info Summary: ===============================

=> Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks in partition 97 for .

sda1: __________________________________________________________________________

File system:       ntfs
Boot sector type:  Grub2 (v1.99)
Boot sector info:  Grub2 (v1.99) is installed in the boot sector of sda1 
                   and looks at sector 222333376 of the same hard drive 
                   for core.img. core.img is at this location and looks 
                   in partition 97 for . No errors found in the Boot 
                   Parameter Block.
Operating System:  
Boot files:        /bootmgr /Boot/BCD

sda2: __________________________________________________________________________

File system:       ntfs
Boot sector type:  Windows Vista/7: NTFS
Boot sector info:  No errors found in the Boot Parameter Block.
Operating System:  
Boot files:        /bootmgr /Boot/BCD /Windows/System32/winload.exe

sda3: __________________________________________________________________________

File system:       ext4
Boot sector type:  Grub2 (v1.99)
Boot sector info:  Grub2 (v1.99) is installed in the boot sector of sda3 
                   and looks at sector 243402888 of the same hard drive 
                   for core.img. core.img is at this location and looks 
                   in partition 97 for .
Operating System:  Ubuntu 16.04.2 LTS
Boot files:        /boot/grub/grub.cfg /etc/fstab

sda4: __________________________________________________________________________

File system:       Extended Partition
Boot sector type:  Unknown
Boot sector info: 

sda5: __________________________________________________________________________

File system:       swap
Boot sector type:  -
Boot sector info: 

sda6: __________________________________________________________________________

File system:       ntfs
Boot sector type:  Windows Vista/7: NTFS
Boot sector info:  No errors found in the Boot Parameter Block.
Operating System:  
Boot files:        



sda1 is partition where Windows "System Reserved" data resides.

Is there some way to remove the grub from there (not just hiding the menu item from loader by grub customizer, but completely remove it)?

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