Unable to connect to dbus HPLIP 3.18.9 on Ubuntu 16.04LTS HP 7740

Running Ubuntu 16.04LTS on HP ProBook 6570b
Printer OfficeJet 7740 connected via WiFi through router.
Hoping to gain access to Tray 2 / 11x17 capability in Ubuntu I installed HPLIP 3.18.9 since I read there were some bug fixes. Had been 3.16.3 which is the current 'Ubuntu' version.
Ran automatic installation package after download.
Tried to print a test page.

Here is the tail end of the installation / test output from the terminal:

Would you like to print a test page (y=yes*, n=no, q=quit) ? y

HP Linux Imaging and Printing System (ver. 3.18.9)
Testpage Print Utility ver. 6.0

Copyright (c) 2001-15 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

warning: Unable to connect to dbus. Is hp-systray running?
Printing test page to printer OfficeJet_Pro_7740...
Test page has been sent to printer.

Then. A time later, This information appeared in the terminal:

RE-STARTING HP_SYSTRAY
----------------------

HP Linux Imaging and Printing System (ver. 3.18.9)
System Tray Status Service ver. 2.0

Copyright (c) 2001-15 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:127: RuntimeWarning: PyOS_InputHook is not available for interactive use of PyGTK
  set_interactive(1)

Here is the output for hp-check:

xx@xx-HP-ProBook-6570b:~/Downloads$ hp-check
Saving output in log file: /home/cw/Downloads/hp-check.log

HP Linux Imaging and Printing System (ver. 3.18.9)
Dependency/Version Check Utility ver. 15.1

Copyright (c) 2001-15 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

Note: hp-check can be run in three modes:
1. Compile-time check mode (-c or --compile): Use this mode before compiling the
HPLIP supplied tarball (.tar.gz or .run) to determine if the proper dependencies
are installed to successfully compile HPLIP.
2. Run-time check mode (-r or --run): Use this mode to determine if a distro
supplied package (.deb, .rpm, etc) or an already built HPLIP supplied tarball
has the proper dependencies installed to successfully run.
3. Both compile- and run-time check mode (-b or --both) (Default): This mode
will check both of the above cases (both compile- and run-time dependencies).

Check types:
a. EXTERNALDEP - External Dependencies
b. GENERALDEP - General Dependencies (required both at compile and run time)
c. COMPILEDEP - Compile time Dependencies
d. [All are run-time checks]
PYEXT SCANCONF QUEUES PERMISSION

Status Types:
    OK
    MISSING - Missing Dependency or Permission or Plug-in
    INCOMPAT - Incompatible dependency-version or Plugin-version

---------------
| SYSTEM INFO |
---------------

 Kernel: 4.15.0-36-generic #39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23 UTC 2018 GNU/Linux
 Host: xx-HP-ProBook-6570b
 Proc: 4.15.0-36-generic #39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23 UTC 2018 GNU/Linux
 Distribution: 12 16.04
 Bitness: 64 bit

-----------------------
| HPLIP CONFIGURATION |
-----------------------

HPLIP-Version: HPLIP 3.18.9
HPLIP-Home: /usr/share/hplip
HPLIP-Installation: Auto installation is supported for ubuntu distro 16.04 version

Current contents of '/etc/hp/hplip.conf' file:
# hplip.conf. Generated from hplip.conf.in by configure.

[hplip]
version=3.18.9

[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/HP
ppdbase=/usr/share/ppd
doc=/usr/share/doc/hplip-3.18.9
html=/usr/share/doc/hplip-3.18.9
icon=/usr/share/applications
cupsbackend=/usr/lib/cups/backend
cupsfilter=/usr/lib/cups/filter
drv=/usr/share/cups/drv/hp
bin=/usr/bin
apparmor=/etc/apparmor.d
# Following values are determined at configure time and cannot be changed.
[configure]
network-build=yes
libusb01-build=no
pp-build=no
gui-build=yes
scanner-build=yes
fax-build=yes
dbus-build=yes
cups11-build=no
doc-build=yes
shadow-build=no
hpijs-install=no
foomatic-drv-install=no
foomatic-ppd-install=no
foomatic-rip-hplip-install=no
hpcups-install=yes
cups-drv-install=yes
cups-ppd-install=no
internal-tag=3.18.9
restricted-build=no
ui-toolkit=qt4
qt3=no
qt4=yes
qt5=no
policy-kit=no
lite-build=no
udev_sysfs_rules=no
hpcups-only-build=no
hpijs-only-build=no
apparmor_build=yes
class-driver=no

Current contents of '/var/lib/hp/hplip.state' file:
Plugins are not installed. Could not access file: No such file or directory

Current contents of '~/.hplip/hplip.conf' file:
[upgrade]
notify_upgrade = true
last_upgraded_time = 1540175486
pending_upgrade_time = 0

[last_used]
device_uri = hp:/net/OfficeJet_Pro_7740_series?ip=192.168.1.2
printer_name = OfficeJet_Pro_7740

[installation]
date_time = 10/21/2018 22:45:52
version = 3.18.9

 <Package-name> <Package-Desc> <Required/Optional> <Min-Version> <Installed-Version> <Status> <Comment>

--------------
| COMPILEDEP |
--------------

 gcc gcc - GNU Project C and C++ Compiler REQUIRED - 5.4.0 OK -
 make make - GNU make utility to maintain groups of programs REQUIRED 3.0 4.1 OK -
 libtool libtool - Library building support services REQUIRED - 2.4.6 OK -

------------------------
| General Dependencies |
------------------------

 libcrypto libcrypto - OpenSSL cryptographic library REQUIRED - 1.0.2 OK -
 python-xml Python XML libraries REQUIRED - 2.1.0 OK -
 libnetsnmp-devel libnetsnmp-devel - SNMP networking library development files REQUIRED 5.0.9 5.7.3 OK -
 sane-devel SANE - Scanning library development files REQUIRED - 1.0.25 OK -
 pil PIL - Python Imaging Library (required for commandline scanning with hp-scan) OPTIONAL - 1.1.7 OK -
 pyqt4-dbus PyQt 4 DBus - DBus Support for PyQt4 REQUIRED 4.0 4.11.4 OK -
 libpthread libpthread - POSIX threads library REQUIRED - 2.23 OK -
 python-devel Python devel - Python development files REQUIRED 2.2 2.7.12 OK -
 cups-devel CUPS devel- Common Unix Printing System development files REQUIRED - 2.1.3 OK -
 python-dbus Python DBus - Python bindings for DBus REQUIRED 0.80.0 1.2.0 OK -
 cups-ddk CUPS DDK - CUPS driver development kit OPTIONAL - - OK -
 reportlab Reportlab - PDF library for Python OPTIONAL 2.0 3.3.0 OK -
 pyqt4 PyQt 4- Qt interface for Python (for Qt version 4.x) REQUIRED 4.0 4.11.4 OK -
 libusb libusb - USB library REQUIRED - 1.0 OK -
 cups-image CUPS image - CUPS image development files REQUIRED - 2.1.3 OK -
 python2X Python 2.2 or greater - Python programming language REQUIRED 2.2 2.7.12 OK -
 python-notify Python libnotify - Python bindings for the libnotify Desktop notifications OPTIONAL - - OK -
 libjpeg libjpeg - JPEG library REQUIRED - - OK -
 sane SANE - Scanning library REQUIRED - 1.0.25 OK -

----------------------
| Scan Configuration |
----------------------

 scanext Scan-SANE-Extension REQUIRED - 3.18.9 OK -
 hpaio HPLIP-SANE-Backend REQUIRED - 3.18.9 OK 'hpaio found in /etc/sane.d/dll.conf'

-------------------------
| External Dependencies |
-------------------------

 gs GhostScript - PostScript and PDF language interpreter and previewer REQUIRED 7.05 9.25 OK -
 scanimage scanimage - Shell scanning program OPTIONAL 1.0 1.0.25 OK -
 cups CUPS - Common Unix Printing System REQUIRED 1.1 2.1.3 OK 'CUPS Scheduler is running'
 network network -wget OPTIONAL - 1.17.1 OK -
 policykit PolicyKit - Administrative policy framework OPTIONAL - 0.105 OK -
 xsane xsane - Graphical scanner frontend for SANE OPTIONAL 0.9 0.999 OK -
 dbus DBus - Message bus system REQUIRED - 1.10.6 OK -
 avahi-utils avahi-utils OPTIONAL - 0.6.32 OK -

---------------------
| Python Extentions |
---------------------

 hpmudext IO-Extension REQUIRED - 3.18.9 OK -
 cupsext CUPS-Extension REQUIRED - 3.18.9 OK -

------------------------------
| DISCOVERED SCANNER DEVICES |
------------------------------

device `hpaio:/net/OfficeJet_Pro_7740_series?ip=192.168.1.2' is a Hewlett-Packard OfficeJet_Pro_7740_series all-in-one

--------------------------
| DISCOVERED USB DEVICES |
--------------------------

No devices found.

---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------

OfficeJet_Pro_7740
------------------
Type: Printer
Device URI: hp:/net/OfficeJet_Pro_7740_series?ip=192.168.1.2
PPD: /etc/cups/ppd/OfficeJet_Pro_7740.ppd
warning: Failed to read /etc/cups/ppd/OfficeJet_Pro_7740.ppd ppd file
PPD Description:
Printer status: printer OfficeJet_Pro_7740 now printing OfficeJet_Pro_7740-49. enabled Processing page 1...8 10:33:33 PM EDT
Communication status: Good

OfficeJet_Pro_7740_fax
----------------------
Type: Fax
Device URI: hpfax:/net/OfficeJet_Pro_7740_series?ip=192.168.1.2
PPD: /etc/cups/ppd/OfficeJet_Pro_7740_fax.ppd
warning: Failed to read /etc/cups/ppd/OfficeJet_Pro_7740_fax.ppd ppd file
PPD Description:
Printer status: printer OfficeJet_Pro_7740_fax is idle. enabled since Sun 21 Oct 2018 10:33:00 PM EDT
Communication status: Good

--------------
| PERMISSION |
--------------

No errors or warnings.

Done.

Where did I go wrong? I purchased this printer so I could use the 11x17 format. It works in Windoze, but not from Linux.

Thank you in advance for your help,