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

X.Org X Server 1.19.6
Release Date: 2017-12-20
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.4.0-119-generic x86_64 Ubuntu
Current Operating System: Linux ubuntu 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64
Kernel command line: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash ---
Build Date: 13 April 2018  08:07:36PM
xorg-server 2:1.19.6-1ubuntu4 (For technical support please see http://www.ubuntu.com/support) 
Current version of pixman: 0.34.0
	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: Tue May 15 11:34:09 2018
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
ubiquity-dm: set vars
ubiquity-dm: pam_open_session
ubiquity-dm: dm-scripts
ubiquity-dm: dconf-service
ubiquity-dm: start frontend gtk_ui
dbus-update-activation-environment: setting XDG_CURRENT_DESKTOP=ubuntu:GNOME
No such schema “org.gnome.metacity”

(gsd-a11y-settings:1758): a11y-settings-plugin-WARNING **: 11:34:11.179: Unable to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
ubiquity-dm: start greeter
dbus-daemon[1773]: Activating service name='org.a11y.atspi.Registry' requested by ':1.0' (uid=999 pid=1765 comm="/usr/lib/gnome-settings-daemon/gsd-xsettings " label="unconfined")
dbus-daemon[1773]: Successfully activated service 'org.a11y.atspi.Registry'
SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry

(gsd-clipboard:1759): clipboard-plugin-WARNING **: 11:34:11.706: Unable to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

(gsd-media-keys:1760): media-keys-plugin-WARNING **: 11:34:11.725: Unable to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

(gsd-xsettings:1765): xsettings-plugin-WARNING **: 11:34:11.734: Failed to get current display configuration state: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.gnome.Mutter.DisplayConfig" does not exist

(gsd-xsettings:1765): xsettings-plugin-WARNING **: 11:34:11.908: Unable to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

(gsd-power:1764): power-plugin-WARNING **: 11:34:12.224: Unable to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

(gsd-media-keys:1760): GLib-CRITICAL **: 11:34:12.433: g_variant_get_va: assertion 'value != NULL' failed

(gsd-media-keys:1760): GLib-CRITICAL **: 11:34:12.433: g_variant_unref: assertion 'value != NULL' failed
Gjs-Message: 11:34:13.239: JS WARNING: [resource:///org/gnome/shell/ui/main.js 340]: reference to undefined property "MetaStage"
Gjs-Message: 11:34:13.255: JS WARNING: [resource:///org/gnome/shell/ui/layout.js 220]: reference to undefined property "MetaWindowGroup"
Gjs-Message: 11:34:13.311: JS WARNING: [resource:///org/gnome/shell/ui/osdMonitorLabeler.js 59]: reference to undefined property "MetaDBusDisplayConfigSkeleton"
current session already has an ibus-daemon.

(gsd-media-keys:1760): GLib-CRITICAL **: 11:34:13.670: g_variant_get_va: assertion 'value != NULL' failed

(gsd-media-keys:1760): GLib-CRITICAL **: 11:34:13.670: g_variant_unref: assertion 'value != NULL' failed
Gjs-Message: 11:34:13.881: JS WARNING: [resource:///org/gnome/shell/ui/slider.js 38]: reference to undefined property "CallyActor"
Gjs-Message: 11:34:14.834: JS WARNING: [resource:///org/gnome/shell/ui/layout.js 29]: reference to undefined property "MetaWindowX11"
GNOME Shell-Message: 11:34:15.054: Error looking up permission: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.impl.portal.PermissionStore was not provided by any .service files

(gnome-shell:1767): GLib-CRITICAL **: 11:34:18.254: g_array_unref: assertion 'array' failed

(gnome-shell:1767): GLib-CRITICAL **: 11:34:18.434: g_array_unref: assertion 'array' failed

(gnome-shell:1767): GLib-CRITICAL **: 11:34:18.450: g_array_unref: assertion 'array' failed

(gnome-shell:1767): GLib-CRITICAL **: 11:34:18.470: g_array_unref: assertion 'array' failed

(gnome-shell:1767): GLib-CRITICAL **: 11:34:18.487: g_array_unref: assertion 'array' failed

(gnome-shell:1767): GLib-CRITICAL **: 11:34:18.505: g_array_unref: assertion 'array' failed

(gnome-shell:1767): GLib-CRITICAL **: 11:34:18.525: g_array_unref: assertion 'array' failed

(gnome-shell:1767): GLib-CRITICAL **: 11:34:18.528: g_array_unref: assertion 'array' failed