How to restore GRUB2?

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Hi,

I don’t know how but, a Windows 8 update crashed GRUB and its configuration. In teh past, I resolved this problem reinstalling Antergos but, now I need resolve this issue without reinstalling.

Is it possible?

I tried to restore GRUB 2 with Repair Boot disk but I couldn’t.

Hi,

I don’t know how but, a Windows 8 update crashed GRUB and its configuration. In teh past, I resolved this problem reinstalling Antergos but, now I need resolve this issue without reinstalling.

Is it possible?

I tried to restore GRUB 2 with Repair Boot disk but I couldn’t.

hi.
Have you had a look at this link on the arch-wiki. It’s a pretty decent one. If this doesnt’ help, I’ll post back here and give you a series of commands that will / might help you.
Let me know.

[https://wiki.archlinux.org/index.php/GRUB#UEFI_systems_2][0]">[https://wiki.archlinux.org/index.php/GR][1] … _systems_2

On [u:3ilauqvf]restoring the bootloader[/u:3ilauqvf], Manjaro linux has a page on thier wiki here. Manjaro is also an Arch-based system. And the commands to chroot into your Antergos partion ( and installing grub onto the EFI partition) using the Antergos .iso file or via USB can be down the way as given in the Manjaro wiki.

[https://wiki.manjaro.org/index.php?title=Restore_the_GRUB_Bootloader][0]">[https://wiki.manjaro.org/index.php?titl][2] … Bootloader

[0]: <a href=
[1]: https://wiki.archlinux.org/index.php/GR
[2]: https://wiki.manjaro.org/index.php?titl

@“Modisc”:1bbzdlm2 said:

hi.
Have you had a look at this link on the arch-wiki. It’s a pretty decent one. If this doesnt’ help, I’ll post back here and give you a series of commands that will / might help you.
Let me know.

[https://wiki.archlinux.org/index.php/GRUB#UEFI_systems_2][0]">[https://wiki.archlinux.org/index.php/GR][1] … _systems_2

On [u:1bbzdlm2]restoring the bootloader[/u:1bbzdlm2], Manjaro linux has a page on thier wiki here. Manjaro is also an Arch-based system. And the commands to chroot into your Antergos partion ( and installing grub onto the EFI partition) using the Antergos .iso file or via USB can be down the way as given in the Manjaro wiki.

[https://wiki.manjaro.org/index.php?title=Restore_the_GRUB_Bootloader][0]">[https://wiki.manjaro.org/index.php?titl][2] … Bootloader[/quote:1bbzdlm2]

Hi Modsic,

I tried torestore bootloader using manjaro’s guide but problem persist. I think that I have problems with 4th step

[0]: <a href=
[1]: https://wiki.archlinux.org/index.php/GR
[2]: https://wiki.manjaro.org/index.php?titl

First reformat boot partition then you basically just need to mount / and /boot, arch-chroot takes care of the rest and uses current /etc/resolv.conf so you should set up internet before chroot. Then re-install the boot loader, i would make sure the packages grub and efibootmgr are updated before going any further. I can’t really give you command by command because i don’t know your system, so these are just examples.

view partitions to figure out what you need to mount

  
  
mount partitions and create /mnt/boot (replace sdx with correct partition)  
mount /dev/sdax /mnt

mkdir /mnt/boot

mount /dev/sdax /mnt/boot

resolve network connection (for wired connection this might help:
[https://wiki.archlinux.org/index.php/beginners’_guide#Wired][0]">[https://wiki.archlinux.org/index.php/be][1] … uide#Wired)

  
  
arch-chroot  
arch-chroot /mnt

re-install boot loader

pacman -S grub efibootmgr

grub-install --target=x86\_64-efi --efi-directory=/boot --bootloader-id=grub\_uefi --recheck

generate grub config

grub-mkconfig -o /boot/grub/grub.cfg

More information on re-installing grub here;
[https://wiki.archlinux.org/index.php?title=GRUB][0]">[https://wiki.archlinux.org/index.php?title=GRUB][2]
and using arch-chroot;
[https://wiki.archlinux.org/index.php/change_root][0]">[https://wiki.archlinux.org/index.php/change_root][3]

edit: arch-chroot is included by default in the archlinux iso but you will need to install it if you are using antergos live media it’s included in the package arch-install-scripts:

pacman -S arch-install-scripts

: <a href=
[1]: https://wiki.archlinux.org/index.php/be
[2]: https://wiki.archlinux.org/index.php?title=GRUB
[3]: https://wiki.archlinux.org/index.php/change_root