> How can I set up a machine to boot in UEFI mode when the running kernel was > booted in legacy mode?
AFAIK it goes something like this: - Use a GPT partition table, rather than MBR (you can usually convert from one to the other without reformatting, but that can require tricky fiddling, so if you can reformat go for it), with an appropriate EFI system partition mounted to /boot/efi. - Install grub-efi-amd64 (or grub-efi-i386, of course), and "grub-install /dev/sda" - reboot You may need extra steps to convince your system to boot from Debian's grub-efi, e.g. copying /boot/efi/efi/debian/grubx64.efi to /boot/efi/efi/boot/bootx64.efi or selecting debian/grubx64.efi from your BIOS's boot menu. IIRC last time I did it, I mostly followed the recipe in https://tanguy.ortolo.eu/blog/article51/debian-efi Stefan
