When you cannot boot into Linux because grub is missing or damaged, these steps can fix it relatively quickly.
Live Boot Media (USB)
Use a thumbdrive with Manjaro burned by Rufus to boot into a temporary copy of Manjaro
== Find Partition ==
Then run
lsblk -f
to figure out the partition you installed manjaro's boot to
== Mount Partition ==
sudo mount /dev/sda# /mnt (# where # of partition)cd /
== Connect to WIFI ==
sudo pacman -Sy
sudo pacman -S mhwd-chroot
sudo mhwd-chroot
== Go to Mount ==
cd /mnt
== Install Grub ==
grub-install /dev/sda --boot-directory=/mnt/boot
update-grub
https://rufus.akeo.ie/
https://wiki.manjaro.org/index.php/Restore_the_GRUB_Bootloader
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