On Fri, Sep 14, 2018 at 2:12 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. > > > sharing /boot actually can work *if* the 2 grubs are in separate > subdirectories, and if the kernels are different enough that updates from > one don't affect the other. still tho it may work, it will likely lead to > significant confusion. I had separate /boot partitions and that didn't seem to help so I removed one and had one /efi and one /boot for both but still no joy. Therefore the question(s). Thanking you for your ideas!!! Dee