Bug#589534: One by one...

[Josef Spillner (kuarepoti-dju.net)]

Apparently the source of confusion is that I was still running version
1.98-1 instead of 1.98+20100710-1. I did install the new version, but due
to the behaviour of the old one and the partition changes, I somehow ended
up in the old partition again. I think the problem doesn't exist anymore
with the new version. The new version now explicitly asks in the postinst
which partitions to maintain grub for, which is good.

However, the issue of unintuitive usage and too vague manual pages remain.
In particular, I would like to have an option like in "extlinux" which
allows you to specify a single device to run update-grub for and use the
kernels from this device. This might be helpful in the creation of image
files, for example, or for repairing the bootloader of other partitions.
Also, the automatisms behind update-grub should be documented in the file.
I tried running grub in a changeroot on a mounted partition as a
workaround, but this will not work:
  /usr/sbin/grub-probe: error: cannot find a device for / (is /dev
mounted?).