end
puts "Update grub..."
- unless File.exists? "#{dir}/usr/sbin/grub-mkconfig"
+ if File.exists? "#{dir}/var/lib/dpkg/info/grub-efi-amd64.list"
+ system({'DEBIAN_FRONTEND' => 'noninteractive'}, "chroot", dir, "apt", "remove", "--purge", "-y", "grub-efi-amd64") or raise "Failed to purge grub-efi"
+ end
+ unless File.exists? "#{dir}/var/lib/dpkg/info/grub-pc.list"
system("chroot", dir, "apt-get", "-qy", "update") or raise "Failed to install grub-pc"
system({'DEBIAN_FRONTEND' => 'noninteractive'}, "chroot", dir, "apt-get", "-y", "install", "grub-pc")
end