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

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

 error: cups          CUPS - Common Unix Printing System                           REQUIRED        1.1             -               INCOMPAT   'CUPS may not be installed or not running'
 gs                   GhostScript - PostScript and PDF language interpreter and previewer REQUIRED        7.05            9.26            OK         -
 error: xsane         xsane - Graphical scanner frontend for SANE                  OPTIONAL        0.9             -               MISSING    'xsane needs to be installed'
 error: scanimage     scanimage - Shell scanning program                           OPTIONAL        1.0             -               MISSING    'scanimage needs to be installed'
 error: dbus          DBus - Message bus system                                    REQUIRED        -               1.12.2          MISSING    'DBUS may not be installed or not running'
 policykit            PolicyKit - Administrative policy framework                  OPTIONAL        -               0.105           OK         -
 network              network -wget                                                OPTIONAL        -               1.19.4          OK         -
 error: avahi-utils   avahi-utils                                                  OPTIONAL        -               -               MISSING    'avahi-utils needs to be installed'

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

 error: libjpeg       libjpeg - JPEG library                                       REQUIRED        -               -               MISSING    'libjpeg needs to be installed'
 error: cups-devel    CUPS devel- Common Unix Printing System development files    REQUIRED        -               -               MISSING    'cups-devel needs to be installed'
 error: cups-image    CUPS image - CUPS image development files                    REQUIRED        -               -               MISSING    'cups-image needs to be installed'
 libpthread           libpthread - POSIX threads library                           REQUIRED        -               b'2.27'         OK         -
 error: libusb        libusb - USB library                                         REQUIRED        -               1.0             MISSING    'libusb needs to be installed'ED        -               1.0             MISSING    'libusb needs to be installed'
 sane                 SANE - Scanning library                                      REQUIRED        -               -               OK         -
 error: sane-devel    SANE - Scanning library development files                    REQUIRED        -               -               MISSING    'sane-devel needs to be installed'
 error: libnetsnmp-devel libnetsnmp-devel - SNMP networking library development files REQUIRED        5.0.9           -               MISSING    'libnetsnmp-devel needs to be installed'
 error: libcrypto     libcrypto - OpenSSL cryptographic library                    REQUIRED        -               1.1.0           MISSING    'libcrypto needs to be installed'
 python3X             Python 2.2 or greater - Python programming language          REQUIRED        2.2             3.6.7           OK         -
 python3-notify2      Python libnotify - Python bindings for the libnotify Desktop notifications OPTIONAL        -               -               OK         -
 error: python3-pyqt4-dbus PyQt 4 DBus - DBus Support for PyQt4                         OPTIONAL        4.0             -               MISSING    'python3-pyqt4-dbus needs to be installed'
 error: python3-pyqt4 PyQt 4- Qt interface for Python (for Qt version 4.x)         REQUIRED        4.0             -               MISSING    'python3-pyqt4 needs to be installed'
 python3-dbus         Python DBus - Python bindings for DBus                       REQUIRED        0.80.0          1.2.6           OK         -
 python3-xml          Python XML libraries                                         REQUIRED        -               2.2.5           OK         -
 error: python3-devel Python devel - Python development files                      REQUIRED        2.2             3.6.7           MISSING    'python3-devel needs to be installed'
 python3-pil          PIL - Python Imaging Library (required for commandline scanning with hp-scan) OPTIONAL        -               1.1.7           OK         -
 python3-reportlab    Reportlab - PDF library for Python                           OPTIONAL        2.0             3.4.0           OK         -

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

 error: libtool       libtool - Library building support services                  REQUIRED        -               -               MISSING    'libtool needs to be installed'
 gcc                  gcc - GNU Project C and C++ Compiler                         REQUIRED        -               7.3.0           OK         -
 make                 make - GNU make utility to maintain groups of programs       REQUIRED        3.0             4.1             OK         -

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

 cupsext              CUPS-Extension  UIRED        -               3.17.10         OK         -
 hpmudext             IO-Extension                                                 REQUIRED        -               3.17.10         OK         -

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

'/etc/sane.d/dll.d/hpaio' not found.
 hpaio                HPLIP-SANE-Backend                                           REQUIRED        -               3.17.10         OK         'hpaio found in /etc/sane.d/dll.conf'
 scanext              Scan-SANE-Extension                                          REQUIRED        -               3.17.10         OK         -

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


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

  Device URI                          Model                     
  ----------------------------------  --------------------------
  hp:/usb/Photosmart_C4200_series?se  HP Photosmart C4200 series
  rial=MY7A1PP24404VP                                           

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

 
Photosmart_C4200
----------------
Type: Printer
Device URI: hp:/usb/Photosmart_C4200_series?serial=MY7A1PP24404VP
PPD: /etc/cups/ppd/Photosmart_C4200.ppd
warning: Failed to read /etc/cups/ppd/Photosmart_C4200.ppd ppd file
PPD Description:
Printer status: printer Photosmart_C4200 is idle.  enabled since Wed 20 Feb 2019 11:07:04 GMT
Communication status: Good


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

 geoffrey@Robert ~ $ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 03eb:8a03 Atmel Corp.
Bus 001 Device 005: ID 1bcf:2987 Sunplus Innovation Technology Inc.
Bus 001 Device 004: ID 8087:0a2a Intel Corp.
Bus 001 Device 003: ID 03f0:5c11 Hewlett-Packard PhotoSmart C4200 Printer series
Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

geoffrey@Robert ~ $ hp-check
Saving output in log file: /home/geoffrey/hp-check.log

HP Linux Imaging and Printing System (ver. 3.17.10)
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 detailsSaving output in log file: /home/geoffrey/hp-check.log

HP Linux Imaging and Printing System (ver. 3.17.10)
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 tatus Types:
    OK
    MISSING       - Missing Dependency or Permission or Plug-in
    INCOMPAT      - Incompatible dependency-version or Plugin-version

warning: 12-18.04 version is not supported. Using 12-17.04 versions dependencies to verify and install...

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

 Kernel: 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 GNU/Linux
 Host: Robert
 Proc: 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 GNU/LinuxHPLIP-Version: HPLIP 3.17.10
HPLIP-Home: /usr/share/hplip
warning: HPLIP-Installation: Auto installation is not supported for 12 distro  18.04 version

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

[hplip]
version=3.17.10

[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/hplip/HP
ppdbase=/usr/share/ppd/hplip
doc=/usr/share/doc/hplip
html=/usr/share/doc/hplip-doc
icon=no
cupsbackend=/usr/lib/cups/backend
cupsfilter=/usr/lib/cups/filter
drv=/usr/share/cups/drv
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=yes
gui-build=yes
scanner-build=yes
fax-build=yes
dbus-build=yes
cups11-build=no
doc-build=yes
shadow-build=no
hpijs-install=yes
foomatic-drv-install=yes
foomatic-ppd-install=yes
foomatic-rip-hplip-install=no
hpcups-install=yes
cups-drv-install=yes
cups-ppd-install=no
internal-tag=3.17.10
restricted-build=no
ui-toolkit=qt5
qt3=no
qt4=no
qt5=yes
 Distribution: 12 18.04
 Bitness: 64 bit


-----------------------
| HPLIP CONFIGURATION |
-----------------------
There's lots more to come. No mmore space.

Yes, printer working perfectly using another laptop. On the peppermint one I keep getting "Device communication error (5012)

Trouble is, how do I tell whether it was my phone trying to sync with outlook, or someone else up to no good? An IP lookup suggests that 92.40.249.198  is in Brighton, Barking or Cardiff, whereas I'm in Norfolk and my ISP is in Scotland, so it looks suspect to my eagle eye.

IP based geolocation doesn't necessarily mean much from a phone I'm afraid.
(in fact it's not that accurate on a landline)

About all you're going to know for sure is that IP is registered to:-

netname:        H3GUK (Three)
descr:          Mobile Broadband Service

and the time of the connection.

I mean Three could theoretically tell you which phone/tower was the point of origin (and probably the users contacts, current/past location, browsing history, etc.) .. but I wouldn't hold your breath unless you're the security services.

Are you sure this printer is working, because the HP Photosmart C4280 is supposed to be fully supported by hplip ?