How to bypass grub user authorization in GNU GRUB

Eyal

7/11/24, 7:26 AM

I have a linux machine and I updated the kernel which I shouldnt have done and now the machine won't boot up, I am trying to boot up with a previous kernel from GRUB but the system required me username and password to edit,run anything. Is there any way to bypass that? Thank you!

0 + 3

grub2

root

windows-subsystem-for-linux

guiverc

7/11/24, 7:32 AM

You're question appears to be about Linux, where SE *Unix & Linux* provides Linux support on Stack Exchange. This is a Ubuntu Q&A site, and I see nothing on-topic for this site (see https://askubuntu.com/help/on-topic). GRUB doesn't have usernames so your question itself makes little sense to me, yes an owner of the system can put a *password* on GRUB that is required (*speak to the owner of the machine for that*) but password is not username+password. FYI: On-topic systems for this site have *root* disabled; with `sudo` providing access when required.

Eyal

7/11/24, 8:30 AM

When I try to choose for example "Advanced options for ubuntu" it required username and password. We have a line of machines here and I can access different machines that do work with admin user and perform all commands but when I try to insert the same username and password there, it does nothing and goes back to the menu as if the username and password i typed in were incorrect.

karel

7/17/24, 10:19 AM

Does this answer your question? [How do I reset a lost administrative password?](https://askubuntu.com/questions/24006/how-do-i-reset-a-lost-administrative-password)

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