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: Fri Apr 27 15:15:20 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:1574): a11y-settings-plugin-WARNING **: 15:15:22.269: 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[1589]: Activating service name='org.a11y.atspi.Registry' requested by ':1.0' (uid=999 pid=1580 comm="/usr/lib/gnome-settings-daemon/gsd-power " label="unconfined")

(gsd-clipboard:1575): clipboard-plugin-WARNING **: 15:15:23.446: 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:1581): xsettings-plugin-WARNING **: 15:15:23.554: Failed to get current display configuration state: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.gnome.Mutter.DisplayConfig" does not exist
dbus-daemon[1589]: Successfully activated service 'org.a11y.atspi.Registry'
SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry

(gsd-power:1580): power-plugin-WARNING **: 15:15:23.761: 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:1581): xsettings-plugin-WARNING **: 15:15:23.970: 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:1576): media-keys-plugin-WARNING **: 15:15:24.508: 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:1576): GLib-CRITICAL **: 15:15:24.948: g_variant_get_va: assertion 'value != NULL' failed

(gsd-media-keys:1576): GLib-CRITICAL **: 15:15:24.949: g_variant_unref: assertion 'value != NULL' failed

(gsd-media-keys:1576): GLib-CRITICAL **: 15:15:26.372: g_variant_get_va: assertion 'value != NULL' failed

(gsd-media-keys:1576): GLib-CRITICAL **: 15:15:26.372: g_variant_unref: assertion 'value != NULL' failed
Gjs-Message: 15:15:27.113: JS WARNING: [resource:///org/gnome/shell/ui/main.js 340]: reference to undefined property "MetaStage"
Gjs-Message: 15:15:27.148: JS WARNING: [resource:///org/gnome/shell/ui/layout.js 220]: reference to undefined property "MetaWindowGroup"
Gjs-Message: 15:15:27.328: JS WARNING: [resource:///org/gnome/shell/ui/osdMonitorLabeler.js 59]: reference to undefined property "MetaDBusDisplayConfigSkeleton"

(gsd-media-keys:1576): GLib-CRITICAL **: 15:15:27.374: g_variant_get_va: assertion 'value != NULL' failed

(gsd-media-keys:1576): GLib-CRITICAL **: 15:15:27.374: g_variant_unref: assertion 'value != NULL' failed
current session already has an ibus-daemon.

(gsd-media-keys:1576): GLib-CRITICAL **: 15:15:28.367: g_variant_get_va: assertion 'value != NULL' failed

(gsd-media-keys:1576): GLib-CRITICAL **: 15:15:28.367: g_variant_unref: assertion 'value != NULL' failed
Gjs-Message: 15:15:28.427: JS WARNING: [resource:///org/gnome/shell/ui/slider.js 38]: reference to undefined property "CallyActor"
Gjs-Message: 15:15:30.334: JS WARNING: [resource:///org/gnome/shell/ui/layout.js 29]: reference to undefined property "MetaWindowX11"
GNOME Shell-Message: 15:15:30.764: 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:1583): GLib-CRITICAL **: 15:15:39.914: g_array_unref: assertion 'array' failed

(gnome-shell:1583): GLib-CRITICAL **: 15:15:40.334: g_array_unref: assertion 'array' failed

(gnome-shell:1583): GLib-CRITICAL **: 15:15:40.383: g_array_unref: assertion 'array' failed

(gnome-shell:1583): GLib-CRITICAL **: 15:15:41.077: g_array_unref: assertion 'array' failed

(gnome-shell:1583): GLib-CRITICAL **: 15:15:41.107: g_array_unref: assertion 'array' failed

(gnome-shell:1583): GLib-CRITICAL **: 15:15:41.147: g_array_unref: assertion 'array' failed

(gnome-shell:1583): GLib-CRITICAL **: 15:15:41.152: g_array_unref: assertion 'array' failed

(gnome-shell:1583): GLib-CRITICAL **: 15:15:41.198: g_array_unref: assertion 'array' failed

(gnome-shell:1583): Gjs-CRITICAL **: 15:17:02.975: Object St.Widget (0x55b5a31e2840), has been already deallocated - impossible to access to it. This might be caused by the fact that the object has been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs
== Stack trace for context 0x55b5a177b4b0 ==
#0 0x55b5a1b20be8 i   resource:///org/gnome/shell/ui/modalDialog.js:93 (0x7f36283f14d8 @ 22)
#1 0x7ffe8bd050d0 b   resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f36283b5de0 @ 71)
#2 0x55b5a1b20b30 i   resource:///org/gnome/gjs/modules/_legacy.js:39 (0x7f36283b5b38 @ 215)
#3 0x55b5a1b20aa0 i   resource:///org/gnome/shell/ui/status/network.js:781 (0x7f35f6007e68 @ 409)
#4 0x7ffe8bd06be0 b   resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f36283b5de0 @ 71)
#5 0x55b5a1b20a18 i   resource:///org/gnome/shell/ui/modalDialog.js:168 (0x7f36283f1a28 @ 92)
#6 0x7ffe8bd07f60 b   resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f36283b5de0 @ 71)
#7 0x7ffe8bd08760 b   self-hosted:913 (0x7f36283f12b8 @ 346)
#8 0x55b5a1b20978 i   resource:///org/gnome/gjs/modules/tweener/tweener.js:208 (0x7f36283d3b38 @ 54)
#9 0x55b5a1b20858 i   resource:///org/gnome/gjs/modules/tweener/tweener.js:337 (0x7f36283d3bc0 @ 1626)
#10 0x55b5a1b207c8 i   resource:///org/gnome/gjs/modules/tweener/tweener.js:350 (0x7f36283d3c48 @ 100)
#11 0x55b5a1b20750 i   resource:///org/gnome/gjs/modules/tweener/tweener.js:365 (0x7f36283d3cd0 @ 10)
#12 0x7ffe8bd0a3e0 b   resource:///org/gnome/gjs/modules/signals.js:128 (0x7f36283d3230 @ 386)
#13 0x55b5a1b206c0 i   resource:///org/gnome/shell/ui/tweener.js:245 (0x7f36283cf808 @ 159)
#14 0x7ffe8bd0b760 b   resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f36283b5de0 @ 71)
#15 0x55b5a1b20640 i   resource:///org/gnome/shell/ui/tweener.js:220 (0x7f36283cf780 @ 15)
ubiquity-dm: greeter exited with code 1
No such schema “org.gnome.metacity”
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
      after 501 requests (501 known processed) with 0 events remaining.
(II) Server terminated successfully (0). Closing log file.
ubiquity-dm: Exiting with code 1