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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?

Michael
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  • Possible duplicate of [How can I repair grub? (How to get Ubuntu back after installing Windows?)](https://askubuntu.com/questions/88384/how-can-i-repair-grub-how-to-get-ubuntu-back-after-installing-windows) – tatsu Jul 15 '19 at 12:32
  • this answer specifically https://askubuntu.com/a/326661/307184 boot on an ubuntu live USB and run boot-repair then reboot – tatsu Jul 15 '19 at 12:33
  • This problem is solved, by re-installing Ubuntu in UEFI mode, the grub is back, so did Windows. Thanks GabrielaGarcia for notifying me of the problem. – Michael Jul 18 '19 at 15:20

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