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I have windows 10 (installed in Hardisk 1) and Ubuntu 16.04LTS (installed in Hardisk 1) in my laptop, and I can select windows or Ubuntu by booting. After updating Ubuntu / windows (I do not know exactly) I can not see the boot menu by booting, and windows starts automatically. In UEFI-configuration, I see only 3 options: "Windows Bootmanager", "USB", "SAMSUNG .....", I think, the 3.option is related to the 2.harddisk for Ubuntu, but I am not able to change the order so that Ubuntu bootloader starts automatically.

After reading some hints from forum, I use EASYUEFI for changing it, but Ubuntu can not boot.

I think, something is wrong after updating of Ubuntu. I installed Ext2fsd freeware for reading and writing Ubuntu partition directly from Windows. Now, I can access everything in Ubuntu-partition.

My question: 1. which file I have to modify for repairing Ubuntu GRUB bootloader?

Can someone please help me? Best thanks Binh

Thanh Binh To
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1 Answers1

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You will want to log into a live usb installation, mount your old install, chroot into the mount, and run 'grub-install /dev/sdX' (most likely sda, could be different depending on which device is your hard drive)

https://help.ubuntu.com/community/Grub2/Installing

Kyle H
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  • because I do not want to use a live usb installation, I wish to edit (change/modify) some files, e.g. in /boot/grub/... – Thanh Binh To Dec 25 '16 at 12:22
  • Edit /etc/default/grub and look for a line GRUB_FORCE_HIDDEN_MENU and change it to ="FALSE" and then run grub-update. When you boot try hitting shift to make grub boot menu appear – Kyle H Dec 25 '16 at 12:31
  • I did not find this line in my /etc/default/grub. – Thanh Binh To Dec 26 '16 at 12:02
  • I did not find this line in my /etc/default/grub. I have only the following registrations: GRUB_DEFAULT=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 acpi=off" GRUB_CMDLINE_LINUX_DEFAULT="" GRUB_CMDLINE_LINUX="" – Thanh Binh To Dec 26 '16 at 12:04
  • I used BootRepair for solving this problem. – Thanh Binh To Dec 27 '16 at 14:12