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Ubuntu 18.04.4 stuck at the loading screen after running the following command and rebooting:

sudo nvidia-xconfig

I forcefully shut it down a couple of times and when I started it again it still hangs there.

enter image description here

I'm standing here looking at the screen and I can't believe that NVIDIA is a 230 bln $ company.

What solutions are there? Is there any way I could access the terminal from here in order to delete the xorg.conf file?

If I press ctrl+alt+F4, it takes me to a screen which says:

xHCI host controller not responding, assume dead
A start job is running for Hold until boot process finishers up
Sandu Ursu
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    Nvidia-xconfig should have created a backup of your former xorg.conf .So login in on one of the TTYs via your username and password , then run cd /etc/X11/ ;sudo mv xorg.conf xorg.conf.nv ;sudo mv xorg.conf.backup xorg.confthen reboot.Note that this only would work if the former xorg.conf had worked for you.I've never seen the config made by Nvidia for X11 works correctly.I don't know why. – Parsa Mousavi Jun 20 '20 at 09:17
  • A windowsy company, no wonder Apple ditched them. Last time I buy a computer with NVIDIA. I think AMD is just about as good now. Looking forward to other GPU manufacturers entering the market.

    I have written below what worked for me. I still have a question there. Isn't that wrong that I wasn't required to enter a password in order to access root?

     – Sandu Ursu Jun 20 '20 at 10:07

1 Answers1

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This worked for me:

At startup, press Esc. Right after the logo disappears press once, don't press it too many times to get to grub.

In the next window I had 3 options:

Ubuntu
Advanced options for Ubuntu
System setup

Choose Advanced options for Ubuntu. Next, select:

  1. Ubuntu with Linux *version* (recovery mode)
  2. root
  3. OK.

Press Enter once and type:

rm /etc/X11/xorg.conf
reboot

Worked fine. But now I have another question: I was not required to enter my root password, anyone could have altered my system. What can I do to protect root access?

Sandu Ursu
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    In terminal run sudo su then passwd and then assign a password to your root account if you haven't already done that. – Parsa Mousavi Jun 20 '20 at 10:10
  • I think that simply changes my sudo password. I already had a sudo password, and yet I wasn't asked for any password in order to access root. – Sandu Ursu Jun 20 '20 at 10:20
  • No that changes the root password , not the password you have to enter when you run sudo.That password I mentioned is for when you want to LOGIN as root(i.e when you type root as the user). And also linux has a caching mechanism (I don't know which subsystem exactly) that caches your entered credentials so that in a process like bash when you enter your password , you don't require to enter it for running any program as root for as long as I think 10 minutes. – Parsa Mousavi Jun 20 '20 at 10:25
  • And also if you access the root user via sudo su because you're a sudoer user , you have to enter your own password , not the root's. But when you run su or when you want to login as root , you have to enter the root password not your own. – Parsa Mousavi Jun 20 '20 at 10:26
  • I have just checked and it changes my sudo password. After running that command I get Password:. No matter what I input, I get: su: Authentication failure / Changing password for admin. / (current) UNIX password: – Sandu Ursu Jun 20 '20 at 10:40
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    I'm confused . You did su then passwd or sudo su then passwd ? in the first case you haven't yet assigned any password to root so you cannot change the user to root.You get su: Authentication failure because you have entered the wrong password for root.You have to use the second one first since you haven't setup the root password : sudo su then passwd. – Parsa Mousavi Jun 20 '20 at 11:26
  • You are right. Thank you!! Note: one might want to change the keyring password too. – Sandu Ursu Jun 20 '20 at 13:38