I've done lots and lots of work on this class of problem over the last
several months. I'm afraid that there are too many bugs about it, too
many of which consist of lots of different people chiming in with lots
of similar symptoms which would have to be individually untangled to
find the different underlying causes, to update each one of them
individually.
This is probably in fact fixed for new systems, but once the GRUB
packaging has forgotten its installation target on any particular system
due to old bugs, it's more or less impossible to recover that
information in any vaguely reliable way. In the cases where we don't
re-prompt automatically, it's generally because it doesn't even know
that it has the wrong install location recorded in the debconf database
(i.e. it has information that looks plausible, but which is wrong). You
need to run 'sudo dpkg-reconfigure grub-pc' to fix it properly on a
given system.
For a more detailed treatment of this, see my blog (which is focused on
Debian versions of grub2, but the issues are largely the same):
I've done lots and lots of work on this class of problem over the last
several months. I'm afraid that there are too many bugs about it, too
many of which consist of lots of different people chiming in with lots
of similar symptoms which would have to be individually untangled to
find the different underlying causes, to update each one of them
individually.
This is probably in fact fixed for new systems, but once the GRUB
packaging has forgotten its installation target on any particular system
due to old bugs, it's more or less impossible to recover that
information in any vaguely reliable way. In the cases where we don't
re-prompt automatically, it's generally because it doesn't even know
that it has the wrong install location recorded in the debconf database
(i.e. it has information that looks plausible, but which is wrong). You
need to run 'sudo dpkg-reconfigure grub-pc' to fix it properly on a
given system.
For a more detailed treatment of this, see my blog (which is focused on
Debian versions of grub2, but the issues are largely the same):
http:// www.chiark. greenend. org.uk/ ucgi/~cjwatson/ blosxom/ debian/ 2010-06- 21-grub2- boot-problems. html www.chiark. greenend. org.uk/ ucgi/~cjwatson/ blosxom/ debian/ 2010-07- 02-grub2- with-luck. html
http://