joplin-notes/joplin notion extension/linux/mint/repair grub after installing windows.md

repair grub after installing windows

https://www.youtube.com/watch?v=Zr9oyWjD6IA https://askubuntu.com/questions/88384/how-can-i-repair-grub-how-to-get-ubuntu-back-after-installing-windows

1. use sudo fdisk -l to find efi and main linux partition
2. Mount linux partition to mnt. sudo mount /dev/sdxy .mnt and then mount efi partition to /mnt/boot/efi. sudo mount /dev/sdab .mnt/boot/efi.
3. chroot to /mnt to access linux partition and then update-grub. Though most probably have to do this step too grub-install /dev/sda sda here but it have to be the drive where efi is installed
4. finally exit and reboot

and if installed distri is arch based then while in chroot do following grub-mkconfig -o /boot/grub/grub.cfg then grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=GRUB