Step-by-step – Reinstall Grub Ubuntu 20.04 Guide

June 30, 2021 | By the+gnu+linux+evangelist | Filed in: Tutorial.

GNU/Linux Ubuntu 20.04 Fixing Grub Guide

Hi! The Tutorial Shows You Step-by-step How to Reinstall/Fix Grub in Ubuntu 20.04 LTS GNU/Linux.

And GNU Grub for Ubuntu 20.04 is a very powerful Boot Loader, which can load a wide variety of Free Operating Systems, as well as Proprietary OSes with Chain-loading.

And a Boot Loader is in charge of loading and transferring control to a Kernel OS Software (such as Linux or GNU Mach).

The Kernel, in turn, initializes the rest of the Operating System (e.g. a GNU system).

Finally, this Setup is Required to Fix an OS Boot after a not achieved Installation or sometimes a GNU+Linux/Windows Dual Boot System.

Step-by-step – Reinstall Grub Ubuntu 20.04 Guide
  1. 1. Launching Terminal

    How-to Quick-Start with Command Line on Ubuntu:

    Console Ubuntu QuickStart Guide

    First Update the Apt Repo Sources with:

    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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