Sometimes I do the normal updates in my windows and it blows up the GRUB. And everytime I forget the steps I have done before to fix it, so to be a note for me I write this.
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
nvme0n1 259:0 0 476.9G 0 disk
├─nvme0n1p1 259:1 0 260M 0 part <--- efi
├─nvme0n1p2 259:2 0 16M 0 part
├─nvme0n1p3 259:3 0 215.7G 0 part
├─nvme0n1p4 259:4 0 1000M 0 part
├─nvme0n1p5 259:5 0 8G 0 part <---- swap
├─nvme0n1p6 259:6 0 248G 0 part <---- root
└─nvme0n1p7 259:7 0 4G 0 part
This all are partitions my current install have. nvme0n1p1 is the efi partition that have all the files needed for booting the installed os’es.
First, I’ll boot into the arch ISO and I will mount the root and efi partition under /mnt and /mnt/efi respectively. Ah I know some people also use /boot/efi as the efi mount point but I have it under /efi.
$ mount /dev/nvme0n1p2 /mnt
$ mount /dev/nvme0n1p6 /mnt/efi
I just use the default config of grub.cfg with no extra options.
Install the GRUB using grub-install
$ grub-install --target=x86_64-efi --efi-directory=/efi --bootloader-id=GRUB
tada! if no errors reported you are good to go, reboot your system you will see the grub menu.
If your system doesn’t load the grub menu instead it boots the Windows in that case just get into the UEFI/Bios(legacy) settings and update the boot priority to the GRUB to be the first. Then save and exit. You will see the GRUB menu.
Hope, I don’t forget this anymore :)