On Sun 30 Mar 2025 at 11:50:52 (+0800), hlyg wrote: > i install with debian-12.10.0-amd64-netinst.iso > > during final stage of installation, it fails to install grub > > "Executing 'grub-install dummy' failed." > "This is a fatal error." > > how to solve it? Presumably that error message was from the screen. Have you looked at /var/log/installer/syslog for more expansive error messages? Cheers, David.