Try these suggestions from ChatGPT that sound reasonable:

   1.

   Switch to a TTY

   Press Ctrl + Alt + F2 (or F3, F4, etc.) to access a terminal login
   prompt.
   2.

   Log in as your user

   If that works, Ubuntu is still functioning, but the graphical
   environment is broken.
   3.

   Check system logs for GDM and GNOME errors

   After logging in via TTY:

   journalctl -xe | grep -i gdm
   journalctl -xe | grep -i gnome

   Look for errors about failing to start the session or display server.

   4. Try restarting the display manager

   From TTY:

   sudo systemctl restart gdm




On Fri, Jul 11, 2025 at 17:36 woolcycle via Liverpool <
[email protected]> wrote:

> Hi everyone,
>
> Further to conversations at the recent meetup, I've had a friend install a
> 500GB SSD + 8GB RAM on my laptop, plus a fresh installs of Windows 10 and
> Ubuntu 24.04.2.
>
> Ubuntu was running well - not to mention very fast - for a day or so, but
> now I am faced with a black screen full of text. (The last thing the GUI
> said to me was "Authentication error" in response to my attempt to re-login
> from sleeping.) The screen full of text is full of green OKs down the side.
> The last line of the text reads:
>
> OK Started gdm.service - GNOME Display Manager.
>
> I'm posting on here as I am not sure if my friend will get back to me
> until Wimbledon is over! And also because I don't have much to go on by way
> of error messages.
>
> Thanks in advance for any help you are able to offer!
> --
> Liverpool mailing list
> [email protected]
> https://mailman.lug.org.uk/mailman/listinfo/liverpool
>
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