ubiquity-dm: starting
ubiquity-dm: plymouth
ubiquity-dm: start X ['X', '-br', '-ac', '-noreset', '-nolisten', 'tcp', '-background', 'none', 'vt1', ':0']

X.Org X Server 1.20.8
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.15.0-115-generic x86_64 Ubuntu
Current Operating System: Linux xubuntu 5.8.0-20-generic #21-Ubuntu SMP Wed Sep 23 00:39:43 UTC 2020 x86_64
Kernel command line: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed maybe-ubiquity quiet splash ---
Build Date: 04 September 2020  01:32:36PM
xorg-server 2:1.20.8-2ubuntu6 (For technical support please see http://www.ubuntu.com/support) 
Current version of pixman: 0.38.4
	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Thu Oct  1 01:19:49 2020
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
resize called 1600 900
ubiquity-dm: set vars
ubiquity-dm: pam_open_session
ubiquity-dm: dm-scripts
ubiquity-dm: start frontend gtk_ui
No such schema “org.gnome.settings-daemon.plugins.background”
No such schema “org.gnome.metacity”
ubiquity-dm: start greeter

(xfsettingsd:1877): GLib-CRITICAL **: 01:19:51.682: g_str_has_prefix: assertion 'prefix != NULL' failed

(xfsettingsd:1877): GLib-GObject-CRITICAL **: 01:19:51.688: g_value_get_string: assertion 'G_VALUE_HOLDS_STRING (value)' failed

(xfsettingsd:1877): GLib-GObject-CRITICAL **: 01:19:51.700: g_value_get_string: assertion 'G_VALUE_HOLDS_STRING (value)' failed

(xfwm4:1871): GLib-CRITICAL **: 01:19:51.839: g_str_has_prefix: assertion 'prefix != NULL' failed

(nm-applet:1875): libnotify-WARNING **: 11:27:16.424: Failed to connect to proxy

(nm-applet:1875): nm-applet-WARNING **: 11:27:37.649: Failed to show notification: Error calling StartServiceByName for org.freedesktop.Notifications: Timeout was reached
(II) AIGLX: Suspending AIGLX clients for VT switch
Failed to connect to session manager: Failed to connect to the session manager: SESSION_MANAGER environment variable not defined

(xfce4-terminal:42611): VTE-WARNING **: 11:29:25.312: (../src/vtepty.cc:839):void vte_pty_spawn_with_fds_async(VtePty*, const char*, const char* const*, const char* const*, const int*, int, const int*, int, GSpawnFlags, GSpawnChildSetupFunc, gpointer, GDestroyNotify, int, GCancellable*, GAsyncReadyCallback, gpointer): runtime check failed: ((spawn_flags & forbidden_args) == 0)