I have to say I'm not sure you will get it to boot on both systems as they both require a different grub (kinda), but if you can have both grub-efi and normal grub installed together it might be possible but would need someone with better experience than myself as this is the exact reason I didn't continue with my external drive as a portable system.
Good luck though and if you manage to get it working please post here as I would like to know how it's done.
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Grub
Re: Grub
Excuse me the problem is Win10 with its ****** secure boot and/or HP notebook. Even if you disable boot security changing boot sequence is ignored.
There is a long procedure that MS propose to deactivate boot security, but it does not work for my brand new HP.
I will call HP to see if there is a solution.
Thank you all
There is a long procedure that MS propose to deactivate boot security, but it does not work for my brand new HP.
I will call HP to see if there is a solution.
Thank you all