If you switch to a different TTY can you restart lightdm? sudo systemctl restart lightdm.

    Hm, if it were a Budgie component or Mutter crashing, the Fail Whale screen should appear telling you to log back out. Or, you would just get kicked back to the login screen.

    Is the above log still current, and is it the full log? I don't see anything there indicating a crash.

    It's not the most current it's from 72h ago. Yesterday (22 of december) journalctl -p err -b -1 and journalctl -b -1 | grep err gave back
    budgie-session-binary[1726]: Unrecoverable failure in required component org.buddiesofbudgie.BudgiePanel.desktop
    and
    gsd-power[975]: Error setting property 'PowerSaveMode' on interface org.gnome.Mutter.DisplayConfig: No se puede invocar al método; el proxy no tiene dueño para un nombre org.gnome.Mutter.DisplayConfigconocido y el proxy se construyó con la opción G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START (g-io-error qurark, 0)

    and also
    gsd-power[1841]: Error setting property 'PowerSaveMode' on interface org.gnome.tter.Displayconfig: No se puede invocar al método; el proy no tiene dueño para un nombre org.gnome.Mutter:DisplayConfigconocido y el proxy se construyó con la opción G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START (g-io-error-quark, 0)

    I suspect there might be some relevant output around the line that says there is an unrecoverable fault in Budgie Panel, likely just above it.

    In addition to that, could you tell me what applets you had on your panel?

      EbonJaeger here are the 2 most recent full journalctl outputs (from one session with current kernel, no other parameter applied and the second one also in current kernel but with nomodeset)

      And these are the applets:

      11 days later

      New update, still the same issue. Paste for the journal sessions, last one the only one able to boot to desktop (with nomodeset). Tried reinstalling mutter, budgie-session and desktop and nemo, since there were some warning about them.

      I am having the exact same problem.

        james8755 There's a bug report by someone else, but solus team is still trying to solve the problem. Apparently nouveau is having some troubles and they can only recommend proprietary drivers, if available.

          ASDTT There's a bug report by someone else, but solus team is still trying to solve the problem.

          The reporter on that issue rolled back to a prior update and re-updated. They no longer have an issue.
          Can other people affected by this issue try installing the proprietary NVIDIA drivers (for supported GPUs), and report your results in that issue? Thanks.

            TraceyC I've posted it in the git report. Thank you.