Three weeks ago, I installed UbuntuMate 20.04 on a 2016 ASUS ROG laptop to give my dad a chance to have a system that is fast compare to his Mac Mini. That laptop had Win 10 installed, and after changing the settings in Win 10, the machine booted from the UM20.04 ISO DVD. Installation went through, no problem.
In the meantime, my dad told me that he doesn't want this laptop, and I would like to reinstall UbuntuMate 20.04 from scratch to make it to my new laptop.
I disabled Secure Boot, I added a new Boot partition (DVD) in the BIOS, ..., what ever I try, it always loads straight the desktop and there is no attempt to use the DVD.
How can I install another operating system?
It must have to do with the Grub loader I suppose, like Win 8/10, when we have to change the Boot method from inside the setting.
I read a lot of entries here (including Wolfman's general description), but I have still not found a clue how I push the system to load from a DVD?
Has somebody of you a genius idea what I could do?
Many thanks in advance.
(just in case somebody is wondering why I want to reinstall UM if I have it already, yes, I could use that system, but I would have the same problem in 2 or 3 years time).