Just popping in to say that I've run into this exact problem on Debian
12 (Bookworm) as well. I'm installing onto a system with two drives in
a raid1 config, so the installer presents a dialog with these choices
for installing GRUB:
- Enter device manually
- /dev/sda (ata-VBOX_HARDDISK_VBcb2c038a-37db3d41)
- /dev/sdb (ata-VBOX_HARDDISK_VB9084690a-b32386db)
If choose "Enter device manually", and type in "/dev/sda", I get two
statuses shown on the next progress bar:
1. running "grub-install /dev/sda"
2. running "update-grub"
If I instead pick the dropdown entry for "/dev/sda", the installer skips
the "grub-install" step and goes right to "update-grub," which leaves the
freshly-installed OS in an unbootable state.
Interestingly, if I *manually* type in /dev/sda (which installs GRUB
properly) and then go back and re-install GRUB using the dropdown entry,
from that point forward the dropdown selection works and I get the
"grub-install" step properly.