Package: cdrom Severity: important Tags: patch During installation, "grub-install dummy" is failed. I have fixed the problem booting the CD installation in rescue mode, make a chroot into my root device (/dev/sdaX) and typing the next commands:
mount -t efivarfs efivarfs /sys/firmware/efi/efivars grub-install update-grub I think efivars is not mounted before the debian-install executed the grub- install. Good luck! -- System Information: Debian Release: bullseye/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 4.19.0-5-amd64 (SMP w/8 CPU cores) Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8), LANGUAGE=es_ES.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled