How do you access the grub interface in Ubuntu?

To access the GRUB interface, you can follow these steps:

1. Firstly, restart your computer.
2. Hold down the Shift key when starting up the computer. If holding down Shift does not work, you can try holding down the Esc key.
3. When you hold down the Shift or Esc key, you will see a menu that includes various options.
4. Press the Enter key after selecting “Advanced options for Ubuntu” using the up or down arrow keys.
5. In the next menu, select the option that says “recovery mode” or something similar, and press the Enter key.
6. Next, you will see some startup and recovery options. Select “root Drop to root shell prompt” and press the Enter key.
7. Now, you will enter a command line interface where a prompt such as “root@your_computer_name:~#” will be displayed.
8. You can perform various commands, including modifying GRUB settings, under this prompt.
9. To exit the GRUB interface, you can input the command “exit” and press the Enter key.

Please note that entering the GRUB interface requires quickly pressing the Shift or Esc key when the computer starts up. Failure to hold down these keys may cause the computer to boot directly into the operating system and bypass the GRUB interface.