I want to start experimenting with CoreOS. I did a bare metal install on a second drive from Ubuntu just now and that worked just fine.
The problem is this older motherboard doesn't allow selecting which SATA drive to boot from so it always boots the lowest SATA drive first .. meaning the Ubuntu. However I have grub on Ubuntu and I should be able to have grub .. boot the second drive .. IF I can figure out the proper grub config. Using grub-customizer and os-prober .. they both see a Linux distro on /dev/sdb3 .. however as I expected I see a "Legacy BIOS Bootable" partition on /dev/sdb1. When I grub boot to /dev/sdb3 .. it seems CoreOS is in a maintenance/recovery mode .. so .. not what I want. Should I try to configure grub to boot /dev/sdb1 like my instincts tell me? Thanks for any help and regards, Gerald Talton
