Note from your bootlog that you have some apparmor policy errors:
https://launchpadlibrarian.net/189391868/BootLog.txt
Your /etc/apparmor.d/tunables/home file should be owned by root with
group root and permissions 0644.
You may need to customize the contents some, here's mine:
# ------------------------------------------------------------------
#
# Copyright (C) 2006-2009 Novell/SUSE
# Copyright (C) 2010 Canonical Ltd.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
# @{HOME} is a space-separated list of all user home directories. While
# it doesn't refer to a specific home directory (AppArmor doesn't
# enforce discretionary access controls) it can be used as if it did
# refer to a specific home directory
@{HOME}=@{HOMEDIRS}/*/ /root/
# @{HOMEDIRS} is a space-separated list of where user home directories
# are stored, for programs that must enumerate all home directories on a
# system.
@{HOMEDIRS}=/home/
# Also, include files in tunables/home.d for site-specific adjustments to
# @{HOMEDIRS}.
#include <tunables/home.d>
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https://bugs.launchpad.net/bugs/1390060
Title:
system running on low graphic mode
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