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I have a dual boot laptop with Windows 8.1 + Ubuntu 16.04. My Windows 8.1 crashed, so I had to reinstall it. After reinstall, Windows boot manager took over and grub2 not coming up any longer. Used Boot Repair utility according to this post, still Grub2 won't come up. Then I followed instructions from scruss on the same post, it did bring back the Grub2, but with several entries that I have no idea what they do (I'm afraid to try out in case it messes up Ubuntu).

The grub menu showed these entries:

Ubuntu
Advanced Options for Ubuntu
Windows UEFI bootmgfw.efi
Windows Boot UEFI loader
Windows Boot UEFI fbx64.efi
EFI/ubuntu/fwupx64.efi
EFI/Ubuntu/mmx64.efi
Windows Boot Manager (on dev/sda4)
System Setup

In my grub file I have the following entries:

GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

How can I clean up the grub file?

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