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. [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/CAK3NTRDmW_1roJWC6FYg+xy=_o3ay8nh-hmkb7abgats7er...@mail.gmail.com