I think (correct me if I'm wrong) what's happening is not "grub getting wiped out" but instead it's the Kubuntu grub being installed to the boot sector and the OP wants to use GRUB from another install.
If this is a correct assessment, why not just delete (remove the grub packages) grub2 from your Kubuntu install? No grub packages, no update, done.
The problem is, if you decide to delete the install which is "hosting" grub, then you will be without an ability to boot at all. That's why pointing your Kubuntu grub to a partition (or a second drive) is a safer option.
Years ago I began using a separate stand-alone grub partition on my desktop PC and installing grub with each installation to my 2nd hard drive. This prevents it from getting wiped out and provides a back-up boot option in case the first hard drive becomes unbootable.
If this is a correct assessment, why not just delete (remove the grub packages) grub2 from your Kubuntu install? No grub packages, no update, done.
The problem is, if you decide to delete the install which is "hosting" grub, then you will be without an ability to boot at all. That's why pointing your Kubuntu grub to a partition (or a second drive) is a safer option.
Years ago I began using a separate stand-alone grub partition on my desktop PC and installing grub with each installation to my 2nd hard drive. This prevents it from getting wiped out and provides a back-up boot option in case the first hard drive becomes unbootable.
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