Arch Linux not booting

fix-arch-boot.md

Fix booting on Arch Linux

If UEFI is used for booting, BIOS needs to be changed!!!

Boot from a USB Stick

Decrypt partition space and name it root

cryptsetup luksOpen /dev/sdaX root

Mount drives

mount /dev/mapper/root /mnt 
# if lvm is used use volume group for root to mount, e.g. /dev/vg0/root /mnt
mount /dev/sdaX /mnt/boot
mount /dev/sdaX /mnt/boot/efi

Chroot into system

arch-chroot /mnt /bin/bash

reinstall the programs to be safe, need 'linux' so the *.img files are generated if WiFi is used probably you need to check wifi-menu first

pacman -S --force linux grub os-prober efibootmgr 

Create initial ramdisk images

mkinitcpio -p linux

Reinstall and configure grub on the drive

bootloader-id: name can be checked by looking into EFI/$PATH

grub-install --target=x86_64-efi \
             --efi-directory=/boot/efi \
             --bootloader-id=arch \ 
             --recheck
             --debug
             /dev/sda

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

Ensure that Arch is the next thing to boot

efibootmgr -n 3

Leave

exit
reboot