Mint Mate 19.3 How To Display Grub Menu At Boot Time, and Help Screen Is Displayed Instead

Tried searching the site again, after several tries I got the database error again.

I need to learn whether the grub menu can be made to display at bootup in this version.

My system does not include gksu, so all attempts at changing /etc/default/grub have been futile.

Also, while trying to display the grub menu by tapping the esc key after powering the desktop on, I do get a menu listing a bunch of commands available.
Don't know if it is normal that the command names list starts with the letter N.
I tried "help" and got a long list of copmmands available.

Would someone please help with answers, and/or refer me to any websites, tutorials etc so I can do the studying?

Thanks much, lex

My System:

System:

Host: lax-HP-Desktop-M01-F1xxx

Kernel: 5.0.0-32-generic x86_64

bits: 64

compiler: gcc

v: 7.4.0

Desktop: MATE 1.22.2

wm: marco

dm: LightDM

Distro: Linux Mint 19.3 Tricia

base: Ubuntu 18.04 bionic

Thanks Again !