On Fri, Sep 14, 2018 at 2:02 PM, gregrwm <tclug1 at whitleymott.net> wrote: >> There are 20+ partitions on the hard disk so both systems have everything >> separate except /boot and /efi (whatever that partition is called). > > > so boot is shared? if so, eek. apt-get update on one will throw out > kernels still expected by the other. and similar ugly contention for > maintaining grub. this would explain why grub couldn't find the other OS. OK that's why I've not been able to get this working! > >> advises that users do not directly edit grub.conf, and use their own >> "discovery" and mangement >> of GRUB scripts. >> >> But I always tweak the grub.conf myself. > > > grub.conf is regenerated, and your mods lost, whenever a new kernel is > installed. i know, i hated it when i first started learning grub2. your > mods belong in /etc/default/grub and /etc/grub.d/40_custom. copy 40_custom > to 07_custom and stuff in there will precede, and thus be what boots by > default. put in there entries which boot via the kernel and initrd in /, > those softlinks are updated whenever a new kernel is installed. then either > regenerate grub.conf, or i confess i then edit the same mods into grub.conf > as well, it's just plain far quicker. > > also if you're interested in how to boot multiple installs all from the same > partition, just ask. Bingo - -- - I've been looking for this and can't find any guides nor ideas - - - so - - - please? (Supplicatory posture entered! (grin!)) Dee