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How do I edit an invalid sudoers file?

I started looking at this question: How to modify an invalid /etc/sudoers file? It throws an error and it's not allowing me to edit again to fix it

But the voted answer assumes that I am allowed to run program as root using Policykit, which is unfortunately not the case.

Here is what happens:

$ sudo visudo

>>> /etc/sudoers: syntax error near line 29 <<<
sudo: parse error in /etc/sudoers near line 29
sudo: no valid sudoers sources found, quitting

What should I do? I have no root access

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Try this:

  • Switch on your computer.

  • Press and hold the Shift key, which will bring up the Grub menu.

  • Select the line which starts with Advanced options.

  • Select the line ending with (recovery mode)

  • Your PC should display a menu with a number of options.

  • Select the option will be Drop to root shell prompt

  • Run the commands

    mount -o remount,rw /
    mount --all
    visudo
    

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