pk@cp:~$ sudo journalctl -b -1 | grep -i "lightdm\|xfce4-session\|display-manager"
[sudo] Passwort für nn: 
Specifying boot ID or boot offset has no effect, no persistent journal was found.
pk@cp:~$
pk@cp:~$ cat ~/.xsession-errors
dbus-update-activation-environment: setting DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
dbus-update-activation-environment: setting DISPLAY=:0
dbus-update-activation-environment: setting XAUTHORITY=/home/nn/.Xauthority
dbus-update-activation-environment: setting XDG_CURRENT_DESKTOP=XFCE
/etc/X11/Xsession.d/30x11-common_xresources: Zeile 16: has_option: Befehl nicht gefunden
dbus-update-activation-environment: setting XDG_DATA_DIRS=/usr/share/xfce4:/home/nn/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share:/var/lib/snapd/desktop
/etc/X11/Xsession.d/75dbus_dbus-launch: Zeile 9: has_option: Befehl nicht gefunden
dbus-update-activation-environment: setting QT_ACCESSIBILITY=1
/etc/X11/Xsession.d/90x11-common_ssh-agent: Zeile 9: has_option: Befehl nicht gefunden
dbus-update-activation-environment: setting SHELL=/bin/bash
dbus-update-activation-environment: setting QT_ACCESSIBILITY=1
dbus-update-activation-environment: setting XDG_CONFIG_DIRS=/etc/xdg/xdg-xubuntu:/etc/xdg
dbus-update-activation-environment: setting CLUTTER_BACKEND=x11
dbus-update-activation-environment: setting LANGUAGE=de_DE
dbus-update-activation-environment: setting DESKTOP_SESSION=xubuntu
dbus-update-activation-environment: setting PWD=/home/nn
dbus-update-activation-environment: setting XDG_SESSION_DESKTOP=xubuntu
dbus-update-activation-environment: setting LOGNAME=nn
dbus-update-activation-environment: setting QT_QPA_PLATFORMTHEME=gtk2
dbus-update-activation-environment: setting XDG_SESSION_TYPE=x11
dbus-update-activation-environment: setting GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
dbus-update-activation-environment: setting XAUTHORITY=/home/nn/.Xauthority
dbus-update-activation-environment: setting XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/nn
dbus-update-activation-environment: setting GDM_LANG=de_DE
dbus-update-activation-environment: setting HOME=/home/nn
dbus-update-activation-environment: setting IM_CONFIG_PHASE=1
dbus-update-activation-environment: setting LANG=de_DE.UTF-8
dbus-update-activation-environment: setting XDG_CURRENT_DESKTOP=XFCE
dbus-update-activation-environment: setting XDG_SESSION_CLASS=user
dbus-update-activation-environment: setting GTK_OVERLAY_SCROLLING=0
dbus-update-activation-environment: setting USER=nn
dbus-update-activation-environment: setting DISPLAY=:0
dbus-update-activation-environment: setting SHLVL=0
dbus-update-activation-environment: setting XDG_RUNTIME_DIR=/run/user/1000
dbus-update-activation-environment: setting XDG_DATA_DIRS=/usr/share/xubuntu:/usr/share/xfce4:/home/nn/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share:/var/lib/snapd/desktop
dbus-update-activation-environment: setting PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
dbus-update-activation-environment: setting GDMSESSION=xubuntu
dbus-update-activation-environment: setting DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
dbus-update-activation-environment: setting _=/usr/bin/dbus-update-activation-environment
/usr/bin/iceauth:  creating new authority file /run/user/1000/ICEauthority
xfce4-session-Message: 08:57:43.226: GNOME compatibility is enabled and gnome-keyring-daemon is found on the system. Skipping gpg/ssh-agent startup.
discover_other_daemon: 1
(xfwm4:2001): xfwm4-WARNING **: 08:57:43.737: Unsupported GL renderer (llvmpipe (LLVM 20.1.2, 256 bits)).

** (xiccd:2200): WARNING **: 08:57:44.922: EDID is empty
Fehlgeschlagen: Entität nicht vorhanden

(xfce4-session:1659): xfce4-session-WARNING **: 08:57:45.059: Unable to launch "blueman-applet" (specified by autostart/blueman.desktop): Kindprozess »blueman-applet« konnte nicht ausgeführt werden (Datei oder Verzeichnis nicht gefunden)

(polkit-mate-authentication-agent-1:2242): GLib-CRITICAL **: 08:57:45.162: g_variant_new_string: assertion 'string != NULL' failed
Cannot register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: An authentication agent already exists for the given subject

(polkit-mate-authentication-agent-1:2242): polkit-mate-1-WARNING **: 08:57:45.169: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

(mousepad:2645): Mousepad-WARNING **: 08:58:34.352: Some 'autosave-*' files in directory '/home/nn/.local/share/Mousepad' do not correspond to any session backup anymore. They will not be deleted automatically: please do it manually to remove this warning.

** (xfce4-clipman:2138): WARNING **: 08:58:45.658: Status Icon is not embedded
[Parent 2662, Main Thread] WARNING: Failed to mkdir /home/nn/snap/thunderbird/1170/.config/ibus/bus: Not a directory: 'glib warning', file /build/thunderbird/parts/thunderbird/build/toolkit/xre/nsSigHandlers.cpp:201

(thunderbird_thunderbird:2662): IBUS-WARNING **: 08:59:39.983: Failed to mkdir /home/nn/snap/thunderbird/1170/.config/ibus/bus: Not a directory
JavaScript error: undefined, line 0: Error: An unexpected error occurred
JavaScript error: resource:///modules/AddrBookManager.sys.mjs, line 291: NS_ERROR_FAILURE: No directory for uri=jsaddrbook://impab.sqlite
JavaScript error: resource:///modules/CalAlarmService.sys.mjs, line 492: TypeError: can't access property "getInTimezone", aItem[(intermediate value).dtz.endDateProp(...)] is null
JavaScript error: resource:///modules/AddrBookManager.sys.mjs, line 291: NS_ERROR_FAILURE: No directory for uri=jsaddrbook://impab.sqlite
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/local/share/doc /usr/local/share/doc none bind,ro 0 0): cannot write to "/var/lib/snapd/hostfs/usr/local/share/doc" because it would affect the host in "/var/lib/snapd"
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/sphinx_rtd_theme /usr/share/sphinx_rtd_theme none bind,ro 0 0): cannot write to "/var/lib/snapd/hostfs/usr/share/sphinx_rtd_theme" because it would affect the host in "/var/lib/snapd"
[Parent 3479, Main Thread] WARNING: Failed to mkdir /home/nn/snap/firefox/8585/.config/ibus/bus: Not a directory: 'glib warning', file toolkit/xre/nsSigHandlers.cpp:200

(firefox_firefox:3479): IBUS-WARNING **: 09:01:49.521: Failed to mkdir /home/nn/snap/firefox/8585/.config/ibus/bus: Not a directory
libEGL warning: DRI3 error: Could not get DRI3 device
libEGL warning: Ensure your X server supports DRI3 to get accelerated rendering
libEGL warning: DRI3 error: Could not get DRI3 device
libEGL warning: Ensure your X server supports DRI3 to get accelerated rendering
libEGL warning: DRI3 error: Could not get DRI3 device
libEGL warning: Ensure your X server supports DRI3 to get accelerated rendering
libEGL warning: DRI3 error: Could not get DRI3 device
libEGL warning: Ensure your X server supports DRI3 to get accelerated rendering
libEGL warning: DRI3 error: Could not get DRI3 device
libEGL warning: Ensure your X server supports DRI3 to get accelerated rendering
libEGL warning: DRI3 error: Could not get DRI3 device
libEGL warning: Ensure your X server supports DRI3 to get accelerated rendering
gimp-2.10: GEGL-WARNUNG: (../gegl/buffer/gegl-tile-handler-cache.c:1076):gegl_tile_cache_destroy: runtime check failed: (g_queue_is_empty (&cache_queue))
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/local/share/doc /usr/local/share/doc none bind,ro 0 0): cannot write to "/var/lib/snapd/hostfs/usr/local/share/doc" because it would affect the host in "/var/lib/snapd"
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/sphinx_rtd_theme /usr/share/sphinx_rtd_theme none bind,ro 0 0): cannot write to "/var/lib/snapd/hostfs/usr/share/sphinx_rtd_theme" because it would affect the host in "/var/lib/snapd"

(brave:7492): IBUS-WARNING **: 09:25:46.857: Failed to mkdir /home/nn/snap/brave/648/.config/ibus/bus: Not a directory
[7535:7535:0706/092602.737122:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.743325:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.746518:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.749436:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.752402:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.756310:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.758550:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.761182:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.763870:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.767720:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.770570:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092602.773689:ERROR:gpu/command_buffer/service/context_group.cc:148] ContextResult::kFatalFailure: WebGL2 blocklisted
[7535:7535:0706/092614.746345:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092614.750507:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092614.877832:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092614.901756:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092617.004184:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092617.061894:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092624.811349:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092624.817333:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092624.847359:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092624.874540:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092642.039764:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
[7535:7535:0706/092642.076354:ERROR:gpu/command_buffer/service/context_group.cc:140] ContextResult::kFatalFailure: WebGL1 blocklisted
JavaScript error: moz-extension://74f973e0-c15c-4be4-929b-704900542e32/scripts/update_ui.js, line 16: TypeError: can't access property "type", message.folder is undefined
[Parent 3479, Main Thread] WARNING: g_app_info_get_name: assertion 'G_IS_APP_INFO (appinfo)' failed: 'glib warning', file toolkit/xre/nsSigHandlers.cpp:200

(firefox_firefox:3479): GLib-GIO-CRITICAL **: 09:51:06.449: g_app_info_get_name: assertion 'G_IS_APP_INFO (appinfo)' failed
[Parent 3479, Main Thread] WARNING: g_app_info_get_icon: assertion 'G_IS_APP_INFO (appinfo)' failed: 'glib warning', file toolkit/xre/nsSigHandlers.cpp:200

(firefox_firefox:3479): GLib-GIO-CRITICAL **: 09:51:06.449: g_app_info_get_icon: assertion 'G_IS_APP_INFO (appinfo)' failed
[Parent 3479, Main Thread] WARNING: g_app_info_get_executable: assertion 'G_IS_APP_INFO (appinfo)' failed: 'glib warning', file toolkit/xre/nsSigHandlers.cpp:200

(firefox_firefox:3479): GLib-GIO-CRITICAL **: 09:51:06.449: g_app_info_get_executable: assertion 'G_IS_APP_INFO (appinfo)' failed
[Parent 3479, Main Thread] WARNING: g_app_info_get_name: assertion 'G_IS_APP_INFO (appinfo)' failed: 'glib warning', file toolkit/xre/nsSigHandlers.cpp:200

(firefox_firefox:3479): GLib-GIO-CRITICAL **: 09:51:06.449: g_app_info_get_name: assertion 'G_IS_APP_INFO (appinfo)' failed

(Thunar:2075): GLib-GIO-CRITICAL **: 09:51:08.125: GFileInfo created without standard::size

(Thunar:2075): GLib-GIO-CRITICAL **: 09:51:08.125: file ../../../gio/gfileinfo.c: line 1845 (g_file_info_get_size): should not be reached

(Thunar:2075): GLib-GIO-CRITICAL **: 09:51:08.129: GFileInfo created without standard::size

(Thunar:2075): GLib-GIO-CRITICAL **: 09:51:08.130: file ../../../gio/gfileinfo.c: line 1845 (g_file_info_get_size): should not be reached

(xfwm4:2001): xfwm4-CRITICAL **: 09:51:23.149: clientMoveToMonitorByDirectionTarget: assertion 'candidate_monitors != NULL' failed

(xfwm4:2001): xfwm4-CRITICAL **: 09:51:23.150: clientMoveToMonitorByDirectionTarget: assertion 'candidate_monitors != NULL' failed

(xfwm4:2001): xfwm4-CRITICAL **: 09:51:23.150: clientMoveToMonitorByDirectionTarget: assertion 'candidate_monitors != NULL' failed

(xfwm4:2001): xfwm4-CRITICAL **: 09:51:23.150: clientMoveToMonitorByDirectionTarget: assertion 'candidate_monitors != NULL' failed

(xfwm4:2001): xfwm4-CRITICAL **: 09:52:00.565: clientMoveToMonitorByDirectionTarget: assertion 'candidate_monitors != NULL' failed

(xfwm4:2001): xfwm4-CRITICAL **: 09:52:00.565: clientMoveToMonitorByDirectionTarget: assertion 'candidate_monitors != NULL' failed

(xfwm4:2001): xfwm4-CRITICAL **: 09:52:00.565: clientMoveToMonitorByDirectionTarget: assertion 'candidate_monitors != NULL' failed

(xfwm4:2001): xfwm4-CRITICAL **: 09:52:00.565: clientMoveToMonitorByDirectionTarget: assertion 'candidate_monitors != NULL' failed

(mousepad:11377): Mousepad-WARNING **: 10:03:21.278: Some 'autosave-*' files in directory '/home/nn/.local/share/Mousepad' do not correspond to any session backup anymore. They will not be deleted automatically: please do it manually to remove this warning.
pk@cp:~$