I have a dual boot system with 2 versions (derivatives) of Ubuntu installed (Linux Mint 17.3 KDE and Kubuntu 18.04).
In order to keep the LM install in control of the GRUB boot manager updates (because it is my primary OS), I installed Kubuntu telling it not to install the boot manager (using
ubiquity -b, which I found in Rod Smith's answer to How to keep grub independent of all the OSes?)
This is working fine. I have to manually run
update-grub from LM after installing a new kernel in Kubuntu in order for it to be on the boot menu.
I'm at the point where I need to switch control of the grub boot manager from the 1st OS (LM) to the 2nd (Kubuntu).
So what I'd like to do is install grub on the 2nd OS (Kubuntu 18.04) so that it updates the grub boot manager on the ESP (efi system partition) and then uninstall grub from the 1st OS so that it no longer updates the grub boot manager on the ESP.
I'd like not to have to wipe my 2nd OS partition and re-install it from scratch.