These are the only suspicious messages happening on login that I can
see:

Feb 05 08:44:15 hostname gnome-shell[3844]: Failed to open sliced image: 
Operation was cancelled
Feb 05 08:44:15 hostname gnome-shell[3844]: Failed to open sliced image: 
Operation was cancelled
Feb 05 08:44:15 hostname gnome-shell[3844]: Failed to open sliced image: 
Operation was cancelled

which may be related to wallpapers and multi-monitor or even to one of
the built-in extensions that ships with Ubuntu.

Try disabling d...@rastersoft.com first and then log in again. If the
bug persists then also try disabling ubuntu-appindicat...@ubuntu.com and
ubuntu-d...@ubuntu.com

Certainly there are image size limit problems we've seen that only exist
in X11 sessions and only with large multi-monitor desktops. So you might
also want to try using Wayland instead (which we strongly recommend).

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https://bugs.launchpad.net/bugs/2089709

Title:
  Ubuntu 24.04 (X11) sometimes logs in to a black screen with only an X
  cursor

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