GNU/Linux Ubuntu Booting Debug Mode Guide
How to Boot Verbose Mode on Ubuntu GNU/Linux desktops – Step by step Tutorials.
And Grub Ubuntu Debug Boot set up make use of the GRUB Customizer GUI Tool.
Especially relevant: with Grub Customizer you can easily manage the Boot Configuration of your Computer.

1. Launching Terminal
Open a Terminal Shell Emulator Window:
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands)sudo apt update
Authenticate with the User Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo.
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