The way dual-mode works is by co-installing grub-efi-amd64*-signed* and grub-pc, this has been the default on desktop for ages, but is not yet supported by the new desktop installer.
The way dual-mode works is by co-installing grub-efi- amd64*- signed* and grub-pc, this has been the default on desktop for ages, but is not yet supported by the new desktop installer.