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

X.Org X Server 1.20.9
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.15.0-130-generic x86_64 Ubuntu
Current Operating System: Linux xubuntu 5.8.0-43-generic #49~20.04.1-Ubuntu SMP Fri Feb 5 09:57:56 UTC 2021 x86_64
Kernel command line: file=/cdrom/preseed/xubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
Build Date: 17 January 2021  09:13:31AM
xorg-server 2:1.20.9-2ubuntu1.2~20.04.1 (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 Aug 12 15:37:28 2021
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(II) modeset(0): Initializing kms color map for depth 24, 8 bpc.
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:1650): GLib-CRITICAL **: 15:37:33.693: g_str_has_prefix: assertion 'prefix != NULL' failed

(xfsettingsd:1650): GLib-GObject-CRITICAL **: 15:37:33.708: g_value_get_string: assertion 'G_VALUE_HOLDS_STRING (value)' failed

(xfsettingsd:1650): GLib-GObject-CRITICAL **: 15:37:33.774: g_value_get_string: assertion 'G_VALUE_HOLDS_STRING (value)' failed

(xfwm4:1643): GLib-CRITICAL **: 15:37:35.017: g_str_has_prefix: assertion 'prefix != NULL' failed
ubiquity-dm: greeter exited with code 0
No such schema “org.gnome.settings-daemon.plugins.background”
No such schema “org.gnome.metacity”
(II) Server terminated successfully (0). Closing log file.
ubiquity-dm: set_locale
Generating locales (this might take a while)...
  en_US.UTF-8... done
Generation complete.
ubiquity-dm: Exiting with code 0

(xfsettingsd:1650): xfsettingsd-WARNING **: 15:39:07.945: Failed to show notification: Sticky keys (Sticky keys are disabled).
Gdk-Message: 15:39:32.978: xfsettingsd: Fatal IO error 25 (Inappropriate ioctl for device) on X server :0.