~/debian-upgrade-to-12# apt-get -o DPkg::Options::="--force-confnew" --reinstall install grub-efi-amd64
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0 B/45.7 kB of archives.
After this operation, 0 B of additional disk space will be used.
Preconfiguring packages ...
(Reading database ... 327719 files and directories currently installed.)
Preparing to unpack .../grub-efi-amd64_2.06-13+deb12u1_amd64.deb ...
Unpacking grub-efi-amd64 (2.06-13+deb12u1) over (2.06-13+deb12u1) ...
Setting up grub-efi-amd64 (2.06-13+deb12u1) ...
Installing for x86_64-efi platform.
Installation finished. No error reported.
Generating grub configuration file ...
Found theme: /boot/grub/themes/minegrub/theme.txt
Found background image: .background_cache.png
Found linux image: /boot/vmlinuz-6.1.0-18-amd64
Found initrd image: /boot/initrd.img-6.1.0-18-amd64
Found linux image: /boot/vmlinuz-5.10.0-28-amd64
Found initrd image: /boot/initrd.img-5.10.0-28-amd64
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
done
Processing triggers for shim-signed:amd64 (1.39+15.7-1) ...



~/debian-upgrade-to-12# dpkg-reconfigure grub-efi-amd64
Installing for x86_64-efi platform.
Installation finished. No error reported.
Generating grub configuration file ...
Found theme: /boot/grub/themes/minegrub/theme.txt
Found background image: .background_cache.png
Found linux image: /boot/vmlinuz-6.1.0-18-amd64
Found initrd image: /boot/initrd.img-6.1.0-18-amd64
Found linux image: /boot/vmlinuz-5.10.0-28-amd64
Found initrd image: /boot/initrd.img-5.10.0-28-amd64
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
done
Processing triggers for shim-signed:amd64 (1.39+15.7-1) ...


~/debian-upgrade-to-12# update-grub
Generating grub configuration file ...
Found theme: /boot/grub/themes/minegrub/theme.txt
Found background image: .background_cache.png
Found linux image: /boot/vmlinuz-6.1.0-18-amd64
Found initrd image: /boot/initrd.img-6.1.0-18-amd64
Found linux image: /boot/vmlinuz-5.10.0-28-amd64
Found initrd image: /boot/initrd.img-5.10.0-28-amd64
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Found Windows Boot Manager on /dev/nvme1n1p1@/EFI/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for UEFI Firmware Settings ...
done