Post more info
sudo os-prober
pacman -Qo /etc/grub.d/*
pacman -Qs grub
pacman -Qs os-prober
grep "prober" /var/log/pacman.log
Post more info
sudo os-prober
pacman -Qo /etc/grub.d/*
pacman -Qs grub
pacman -Qs os-prober
grep "prober" /var/log/pacman.log