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

X.Org X Server 1.18.4
Release Date: 2016-07-19
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.4.0-45-generic x86_64 Ubuntu
Current Operating System: Linux ubuntu-gnome 4.9.0-11-generic #12-Ubuntu SMP Mon Dec 12 16:18:23 UTC 2016 x86_64
Kernel command line: file=/cdrom/preseed/ubuntu-gnome.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
Build Date: 25 October 2016  09:41:32AM
xorg-server 2:1.18.4-1ubuntu7 (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: Thu Jan 19 20:52:44 2017
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
pci id for fd 11: 80ee:beef, driver (null)
EGL_MESA_drm_image required.
ubiquity-dm: set vars
ubiquity-dm: pam_open_session
ubiquity-dm: dm-scripts
ubiquity-dm: dconf-service
ubiquity-dm: start frontend gtk_ui
No such schema “org.gnome.metacity”
ubiquity-dm: Failed with an exception:
ubiquity-dm: Traceback (most recent call last):
  File "/usr/bin/ubiquity-dm", line 851, in main
    ret = run(vt, display, username)
  File "/usr/bin/ubiquity-dm", line 826, in run
    ret = dm.run(*sys.argv[4:])
  File "/usr/bin/ubiquity-dm", line 551, in run
    os.environ['GTK_MODULES'] += os.pathsep + 'gail'
  File "/usr/lib/python3.5/os.py", line 725, in __getitem__
    raise KeyError(key) from None
KeyError: 'GTK_MODULES'

(II) Server terminated successfully (0). Closing log file.

** (gnome-settings-daemon:1678): WARNING **: Unable to initialize GTK+
Activating service name='org.a11y.atspi.Registry'
Successfully activated service 'org.a11y.atspi.Registry'