Now that grub2 1.99-19 was uploaded, this doesn't just affect grub.cfg:
* Add grub-probe to grub-mount-udeb (LP: #963471).
grub-installer's prompt before installing GRUB is now, from what I can
see, always broken, so it's at least as bad as the grub.cfg actually
generated. Therefore, this doesn't cause #666750 anymore. The worst that
should happen now if users are careful is that they'd refuse to install
Debian.
There are now 2 scenarios:
1. If installing a Linux image different from the installer's image,
both the prompt and the actual grub.cfg will lack other OS-en, so
this is a consistent failure.
2. If installing the same Linux image as the installer's, the prompt
will lack other OS-en, but the actual grub.cfg will have other
OS-en, so this is just a false alarm.
I witnessed scenario 1 installing i386 on a recent desktop (686-pae). I
witnessed scenario 2 installing i386 on a non-PAE laptop. Installs of
the amd64 architecture should be in scenario 2. In the end, this is a
regression for amd64, but a big (unintended) "improvement" for i386.
