On Friday 21 November 2014 22:43:11 Ross Boylan wrote: > On Thu, Nov 20, 2014 at 9:11 PM, Scott Ferguson > > <scott.ferguson.debian.u...@gmail.com> wrote: > > On 21/11/14 15:13, Ross Boylan wrote: > >> Over the last week I've repeatedly found my machine unbootable, in the > >> sense I couldn't get to a working system without intervention. > >> Sometimes I couldn't even get the grub2 menu. > > > > Tick > > I don't understand what you mean by tick.
You Americans! It's lucky that we English can talk American. Tick is the English for check. > [snip] > > >> Could changing the boot order in the BIOS change the drive mappings > >> and screw up grub that way? > > > > Yes. > > Whichever drive I booted off of sda and sdb always referred to the > same physical devices. And that was even though I booted into > different operating system instances. > > But I guess the fact that linux can keep the names safe (via udev > remembering serial numbers I suspect) doesn't really speak to the > drive mappings that grub sees in its early operation. > > [snip] > > > I've had a 'similar' problem, in my case it was solved with:- > > grub-install /dev/$Whatever > > I either executed that explicitly or, I assume, the grub package > installation machinery did it for me. But I still had trouble. > > grub needs to know where it should jump to. I don't know how it can > figure that out from inside a chroot. For example, say /boot inside > the chroot is mounted from sdb2. To the chroot, it's just part of the > filesystem. How is grub-install to figure out that, when it loads > from the start of the disk, it should look for the grub directory (not > /boot/grub) of the appropriate partition? The only possibility I can > think of would be that it looks in /etc/fstab. > > > If the problem is GRUB, and you are actually booting from sdb (due to > > the BIOS settings making it the boot device. > > > > Note: double check device names (you can use the GRUB device name) with > > the mount command and use SMART to determine which device it the one set > > to boot from in the BIOS. > > > > > > Hope that helps. > > > > > > Kind regards > > Thanks for your response. > Ross -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/201411212259.11877.lisi.re...@gmail.com