Well, before I installed Elive I installed MX Linux in dual-boot.
I didn’t like it so I used the app OS uninstall to get rid of it.
A few days days later I installed Elive.
Somewhere in the installations, I had to use the command update-grub in the terminal of Mint and it reinstalled Grub. I think I also had to use Boot Repair but can’t repair the moment I did.
The problem I had was that Grub would not see the second Linux after its installation.
I just can’t remember what and when I re-installed Grub and what happened to Grub when I did,