Hi Juanito:
I hope this catches your attention because your name is on the grub2-multi.tcz extension description.
After installing the extension, I executed the mount and grub-install commands shown in the "how to"
instructions. (I'm using partition sda3 on my test machine).
I checked the /mnt/sda3/boot/grub directory, but no grub.cfg was created.
From an online Grub 2.02 manual, I found a description of the grub-mkconfig command which usually creates grub.cfg.
Accordingly, I entered sudo grub-mkconfig -o /boot/grub/grub.cfg
I got the following error message:
/usr/local/sbin/grub-probe: error: failed to get canonical path of 'rootfs'
Please advise on what to do.
Thanks !
Len E.