sudo fdisk -l
sudo su/dev/sdXn should be replaced with the right device information, and depending on your installation you may have or have not a seperate /boot partition. If not /boot is a folder under / on the same partition as the filesystem root.
mount /dev/sdXn /mnt= / root partition
mount /dev/sdXn /mnt/boot= /boot partition --> without extra /boot partition you do not need this step!
mount /dev/sdXn /mnt/boot/efi= the EFI-boot (fat) partition
arch-chroot /mntBUT that grub is not in the boot list can be caused also by EFI-Boot-Settings not related to Grub and Antergos then, so re-/installing-/building grub may not solve your problem… You can also make shure to get second (dual boot) installation rechecked and put into grub boot menu: (as root also) If you have dualboot os-prober may takes a long long time to work, the trick here is to mount all other partitions, before using it.
grub-mkconfig -o /boot/grub/grub.cfgReinstall grub:
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=Antergos-grubFor legacy (bios) systems go here: https://antergos.com/wiki/miscellaneous/how-to-fix-grub-with-bios-boot/
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