Dual Boot install on Ubuntu 20.04

Known issue with ubuntu-16.04.3-desktop-amd64

May need to install os-prober to enable multi-boot on Ubuntu.

Have a look at your Ubuntu’s /boot/grub/grub.cfg

Also use terminal to check your partitions, Example command: sudo gdisk /dev/sdb

Found openSUSE was ignored, not included in the grub.cfg then when install Ubuntu OS.

Need a change in Ubuntu - believe installed os-prober to enable multi-boot.

When done Ubuntu recognized and allowed selection of my openSUSE boot partition.

From time do upgrade Ubuntu with clean install, so need again re-organise my openSUSE root partition.

Earlier, found when boots to Ubuntu, by editing grub so add correct boot address for openSUSE 15.2 it starts ok.

Example boot addresses
**set boot=‘hd0,sda2’ **
set root='hd0,gpt1’

openSUSE use more, so so boot into openSUSE then did the grub2-mkconfig -o /boot/grub2/grub.cfg

Result is openSUSE is my default boot, with option to select Ubuntu.