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Re: Debian 8 and Debian 9 Dual Boot

On Wed, 29 Nov 2017 18:19:13 +0000
Joe <joe@xxxxxxxxxxxxxx> wrote:

Wrong button. Let's try again:

> On Wed, 29 Nov 2017 13:07:01 -0500
> Dan Norton <dnorton@xxxxxxxxxxxxxx> wrote:

> > 
> > After POST, the following appears:
> > 
> > [...]
> > PXE-E53: No boot filename received
> > PXE-MOF: Exiting PXE ROM.
> > ERROR:No boot disk has been detected or the disk has failed.
> > 
> > Isn't that because the primary is not mounted to /boot?

This goes back to before anything even knows what or where /boot is,
or partitions, or LVM, or anything. Some code needs to be written to the
drive to get the whole process started and to call grub. The hardware
will reset to the very beginning of the drive, and it needs to find the
first stage of a bootloader there. At the moment, it isn't.

> > 
> > Sorry to be so dense, but how do I "have the primary mounted
> > to /boot?"

At this point, with apparently nothing to lose, I'd get back into the
new installation with the boot disc, then try:

grub-install /dev/<your drive, not a partition>
 (which will get some bootloader code in place)

 (which will look around, configure grub to find its own / and /boot
 and any other installed OSes, and recreate an initial ramdisk)

It looks as if no bootloader code was written to the drive during
installation. Let us hope that whatever prevented it does not prevent
grub-install from working.