hplip 3.17.4 doesn't configure wireless printer

[smurf]

I recently bought a HP 1102w laser printer, I tried to install and configure it trough HPLIP 3.17.4 on my Ubuntu 16.04 linux box, but unfortunately I couldn't achieve it.
I connected the printer with the USB cable, I opened a terminal and ran hp-wificonfig, but all the times I tried it I had to wait for a couple of minutes and finally I received always the same error message: "error 404 file not found".
On my linux box I have Virtualbox running Windows XP, so I installed the software from the cd included in the printer package in Windows XP, I connected the printer to XP via USB and in a few seconds I configured my wireless printer.
I ran hp-doctor and the only warning I found was this:
warning: Failed to read /etc/cups/ppd/HP_LJ_P1102w.ppd ppd file

hp-check output

luca@pc-sala:~$ hp-check
Saving output in log file: /home/luca/hp-check.log

HP Linux Imaging and Printing System (ver. 3.17.4)
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

/
** (hp-check:14712): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program org.a11y.Bus: No such file or directory
-
** (xsane:14781): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program org.a11y.Bus: No such file or directory

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

 Kernel: 4.4.0-79-generic #100-Ubuntu SMP Wed May 17 19:58:14 UTC 2017 GNU/Linux
 Host: pc-sala
 Proc: 4.4.0-79-generic #100-Ubuntu SMP Wed May 17 19:58:14 UTC 2017 GNU/Linux
 Distribution: 12 16.04
 Bitness: 64 bit

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

HPLIP-Version: HPLIP 3.17.4
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=3.17.4

[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/HP
ppdbase=/usr/share/ppd
doc=/usr/share/doc/hplip-3.17.4
html=/usr/share/doc/hplip-3.17.4
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=3.17.4
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=no

Current contents of '/var/lib/hp/hplip.state' file:
[plugin]
installed = 1
eula = 1
version = 3.17.4

Current contents of '~/.hplip/hplip.conf' file:
[upgrade]
notify_upgrade = false
last_upgraded_time = 1495575397
pending_upgrade_time = 0
latest_available_version = 3.16.11

[settings]
systray_visible = 0
systray_messages = 0

[last_used]
device_uri = "hp:/net/Deskjet_3520_series?ip=10.21.39.105"
printer_name =
working_dir = .

[commands]
scan = /usr/bin/xsane -V %SANE_URI%

[refresh]
rate = 30
enable = false
type = 1

[polling]
enable = false
interval = 5
device_list =

[fax]
voice_phone =
email_address =

[installation]
date_time = 10/06/17 23:08:10
version = 3.17.4

 <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 - 3.17.4 OK -
 hpaio HPLIP-SANE-Backend REQUIRED - 3.17.4 OK 'hpaio found in /etc/sane.d/dll.conf'

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

 gs GhostScript - PostScript and PDF language interpreter and previewer REQUIRED 7.05 9.18 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 -
 scanimage scanimage - Shell scanning program OPTIONAL 1.0 1.0.25 OK -
 policykit PolicyKit - Administrative policy framework OPTIONAL - 0.105 OK -

** (xsane:14973): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program org.a11y.Bus: No such file or directory

** (xsane:14977): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program org.a11y.Bus: No such file or directory
 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 - 3.17.4 OK -
 cupsext CUPS-Extension REQUIRED - 3.17.4 OK -

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

device `hpaio:/net/Deskjet_3520_series?ip=10.21.39.105' is a Hewlett-Packard Deskjet_3520_series all-in-one

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

No devices found.

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

Deskjet_3520
------------
Type: Printer
Device URI: hp:/net/Deskjet_3520_series?ip=10.21.39.105
PPD: /etc/cups/ppd/Deskjet_3520.ppd
warning: Failed to read /etc/cups/ppd/Deskjet_3520.ppd ppd file
PPD Description:
Printer Backend /usr/lib/cups/backend/hp does not exist!tada desde lun 14 nov 2016 22:51:02 PET -
Communication status: Good

HP_LJ_P1102w
------------
Type: Printer
Device URI: hp:/net/HP_LaserJet_Professional_P_1102w?ip=10.21.39.104
PPD: /etc/cups/ppd/HP_LJ_P1102w.ppd
warning: Failed to read /etc/cups/ppd/HP_LJ_P1102w.ppd ppd file
PPD Description:
Printer status: la impresora HP_LJ_P1102w está inactiva. activada desde dom 04 jun 2017 19:17:07 PET
Required plug-in status: Installed
Communication status: Good

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

No errors or warnings.

Done.
luca@pc-sala:~$

[Manfred Hampl (m-hampl)]

"... Failed to read /etc/cups/ppd/Deskjet_3520.ppd ..."

Perhaps missing access rights.
What is the output of

sudo ls -l /etc/cups/ppd/Deskjet_3520.ppd
groups

If the ppd file is group-owned by "lp", but you are not member of the "lp" group, then you have to add yourself to that group.

[smurf (luca-dgh)]

Thx a lot for your answer.
The ppd file is not the problem, I can manage it, the real problem I want to remark is that hplip wasn't able to configure the wireless connection of the printer.