troubles after installing ubuntu 20.04

Did you then install all the packages it said were missing or not running....?

Hello Andrew I installed two missing optional dependencies but the third /the last one couldn not install and the messing requiered dependencies I installed all of them but python3-pyqt4 .Then I tried to print but it was in vain stiil persist the same problem poping up different messages Error...or is connecting to the device.
Again I send you the out put the two first missing required dependencies are already installed and the third as before it can not be located and the missing package of optional dependencies as well as before could not be located.
restineclear@prestineclear-IMEDIA-A3507-SP:~$ sudo apt-get update
[sudo] password for prestineclear:
Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [107 kB]
Hit:2 http://es.archive.ubuntu.com/ubuntu focal InRelease
Get:3 http://es.archive.ubuntu.com/ubuntu focal-updates InRelease [111 kB]
Hit:4 https://repo.jellyfin.org/ubuntu focal InRelease
Get:5 http://es.archive.ubuntu.com/ubuntu focal-backports InRelease [98,3 kB]
Fetched 317 kB in 2s (192 kB/s)
Reading package lists... Done
prestineclear@prestineclear-IMEDIA-A3507-SP:~$ sudo hp-check -t
Saving output in log file: /home/prestineclear/hp-check.log

HP Linux Imaging and Printing System (ver. 3.20.3)
Dependency/Version Check Utility ver. 15.1

Copyright (c) 2001-18 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

warning: ubuntu-20.04 version is not supported. Using ubuntu-19.10 versions dependencies to verify and install...

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

 Kernel: 5.4.0-48-generic #52-Ubuntu SMP Thu Sep 10 10:58:49 UTC 2020 GNU/Linux
 Host: prestineclear-IMEDIA-A3507-SP
 Proc: 5.4.0-48-generic #52-Ubuntu SMP Thu Sep 10 10:58:49 UTC 2020 GNU/Linux
 Distribution: ubuntu 20.04
 Bitness: 64 bit

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

HPLIP-Version: HPLIP 3.20.3
HPLIP-Home: /usr/share/hplip
warning: HPLIP-Installation: Auto installation is not supported for ubuntu distro 20.04 version

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

[hplip]
version=3.20.3

[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=no
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=no
foomatic-rip-hplip-install=no
hpcups-install=yes
cups-drv-install=yes
cups-ppd-install=no
internal-tag=3.20.3
restricted-build=no
ui-toolkit=qt5
qt3=no
qt4=no
qt5=yes
policy-kit=yes
lite-build=no
udev_sysfs_rules=no
hpcups-only-build=no
hpijs-only-build=no
apparmor_build=no
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:
warning: Could not access file: No such file or directory
 <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 9.50 OK -
 xsane xsane - Graphical scanner frontend for SANE OPTIONAL 0.9 0.999 OK -
 scanimage scanimage - Shell scanning program OPTIONAL 1.0 1.0.29 OK -
 dbus DBus - Message bus system REQUIRED - 1.12.16 OK -
 policykit PolicyKit - Administrative policy framework OPTIONAL - 0.105 OK -
 network network -wget OPTIONAL - 1.20.3 OK -
 avahi-utils avahi-utils OPTIONAL - 0.7 OK -

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

 libjpeg libjpeg - JPEG library REQUIRED - - OK -
 cups-devel CUPS devel- Common Unix Printing System development files REQUIRED - - OK -
 cups-image CUPS image - CUPS image development files REQUIRED - - OK -
 libpthread libpthread - POSIX threads library REQUIRED - b'2.31' OK -
 libusb libusb - USB library REQUIRED - 1.0 OK -
 sane SANE - Scanning library REQUIRED - - OK -
 sane-devel SANE - Scanning library development files REQUIRED - - OK -
 libnetsnmp-devel libnetsnmp-devel - SNMP networking library development files REQUIRED 5.0.9 5.8 OK -
 libcrypto libcrypto - OpenSSL cryptographic library REQUIRED - 1.1.1 OK -
 python3X Python 2.2 or greater - Python programming language REQUIRED 2.2 3.8.5 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 1.2.16 OK -
 python3-xml Python XML libraries REQUIRED - 2.2.9 OK -
 python3-devel Python devel - Python development files REQUIRED 2.2 3.8.5 OK -
 python3-pil PIL - Python Imaging Library (required for commandline scanning with hp-scan) OPTIONAL - 7.0.0 OK -
 python3-reportlab Reportlab - PDF library for Python OPTIONAL 2.0 3.5.34 OK -

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

 libtool libtool - Library building support services REQUIRED - 2.4.6 OK -
 gcc gcc - GNU Project C and C++ Compiler REQUIRED - 9.3.0 OK -
 make make - GNU make utility to maintain groups of programs REQUIRED 3.0 4.2.1 OK -

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

 cupsext CUPS-Extension REQUIRED - 3.20.3 OK -
 hpmudext IO-Extension REQUIRED - 3.20.3 OK -

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

'/etc/sane.d/dll.d/hpaio' not found.
 hpaio HPLIP-SANE-Backend REQUIRED - 3.20.3 OK 'hpaio found in /etc/sane.d/dll.conf'
 scanext Scan-SANE-Extension REQUIRED - 3.20.3 OK -

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

device `escl:http://192.168.1.103:8080' is a ESCL Deskjet 2540 series [202F13] flatbed scanner
device `escl:http://127.0.0.1:60000' is a ESCL Deskjet 2540 series [CN573692JP0604] flatbed scanner
device `epson2:net:192.168.1.28' is a Epson PID 085E flatbed scanner
device `hpaio:/usb/Deskjet_2540_series?serial=CN573692JP0604' is a Hewlett-Packard Deskjet_2540_series all-in-one
device `hpaio:/net/deskjet_2540_series?ip=192.168.1.103&queue=false' is a Hewlett-Packard deskjet_2540_series all-in-one

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

  Device URI Model
  -------------------------------- ----------------------
  hp:/usb/Deskjet_2540_series?seri HP Deskjet 2540 series
  al=CN573692JP0604

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

Deskjet-2540
------------
Type: Printer
Device URI: hp:/usb/Deskjet_2540_series?serial=CN573692JP0604
PPD: /etc/cups/ppd/Deskjet-2540.ppd
PPD Description: HP Deskjet 2540 Series, hpcups 3.20.3
Printer status: printer Deskjet-2540 now printing Deskjet-2540-33. enabled since mié 07Rendering completed
error: Device busy: hp:/usb/Deskjet_2540_series?serial=CN573692JP0604
error: Device not found
error: Communication status: Failed

Deskjet_2540_2
--------------
Type: Printer
Device URI: hp:/usb/Deskjet_2540_series?serial=CN573692JP0604
PPD: /etc/cups/ppd/Deskjet_2540_2.ppd
PPD Description: HP Deskjet 2540 Series, hpcups 3.20.3
Printer status: printer Deskjet_2540_2 is idle. enabled since mié 07 oct 2020 23:32:44
error: Device busy: hp:/usb/Deskjet_2540_series?serial=CN573692JP0604
error: Device not found
error: Communication status: Failed

Deskjet_2540_series_202F13_
---------------------------
Type: Unknown
Device URI: implicitclass://Deskjet_2540_series_202F13_/
PPD: /etc/cups/ppd/Deskjet_2540_series_202F13_.ppd
PPD Description: HP Deskjet 2540 series, driverless, cups-filters 1.27.4
Printer status: printer Deskjet_2540_series_202F13_ is idle. enabled since mié 07 oct 2020 22:32:53
warning: Printer is not HPLIP installed. Printers must use the hp: or hpfax: CUPS backend for HP-Devices.

Deskjet_2540_series_CN573692JP0604_
-----------------------------------
Type: Unknown
Device URI: implicitclass://Deskjet_2540_series_CN573692JP0604_/
PPD: /etc/cups/ppd/Deskjet_2540_series_CN573692JP0604_.ppd
PPD Description: HP Deskjet 2540 series, driverless, cups-filters 1.27.4
Printer status: printer Deskjet_2540_series_CN573692JP0604_ is idle. enabled since mié 07 oct 2020 22:32:37
warning: Printer is not HPLIP installed. Printers must use the hp: or hpfax: CUPS backend for HP-Devices.

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

USB Deskjet-2540 Required - - OK Node:'/dev/bus/usb/002/002' Perm:' root lp rw- rw- rw- rw- r--'

-----------
| SUMMARY |
-----------

Missing Required Dependencies
-----------------------------
error: 'libcups2' package is missing/incompatible
error: 'python3-pyqt4' package is missing/incompatible
error: 'gtk2-engines-pixbuf' package is missing/incompatible

Missing Optional Dependencies
-----------------------------
error: 'python3-dbus.mainloop.qt' package is missing/incompatible

Total Errors: 5
Total Warnings: 3

Done.
prestineclear@prestineclear-IMEDIA-A3507-SP:~$ sudo apt-get install libcups2
Reading package lists... Done
Building dependency tree
Reading state information... Done
libcups2 is already the newest version (2.3.1-9ubuntu1.1).
The following packages were automatically installed and are no longer required:
  libgutenprint-common libgutenprint9 libpaps0 paps
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
prestineclear@prestineclear-IMEDIA-A3507-SP:~$ sudo apt-get install python3-pyqt4
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package python3-pyqt4
prestineclear@prestineclear-IMEDIA-A3507-SP:~$ sudo apt-get install gtk2-engines-pixbuf
Reading package lists... Done
Building dependency tree
Reading state information... Done
gtk2-engines-pixbuf is already the newest version (2.24.32-4ubuntu4).
The following packages were automatically installed and are no longer required:
  libgutenprint-common libgutenprint9 libpaps0 paps
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
prestineclear@prestineclear-IMEDIA-A3507-SP:~$ sudo apt-get install python3-dbus.mainloop.qt
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package python3-dbus.mainloop.qt
E: Couldn't find any package by glob 'python3-dbus.mainloop.qt'
E: Couldn't find any package by regex 'python3-dbus.mainloop.qt'
prestineclear@prestineclear-IMEDIA-A3507-SP:~$

And as you see Error written en red it detect the same divice with diferent identification numbers Deskjet_2540_2 and Deskjet_2540_series_202F13_.
Thank you for your interest to help and for your precious time

Hi Bernard first thank you for answering my question.
Actually I had found the solution for my printer even if it is a little bit slow.In fact I tried many thing and the last one was searching on synaptic packages manager I wrote printer and it had came up with many packages to install but first I had downloaded the broken one ,so after a long time I installed all the needed packages but really it was in vain ,therefore I headed for the last resource; to erase the disc and install a fresh Ubuntu 20.04 again and with that I could print.And this it was many days ago now.
So thank you heartily Bernard

Sorry something went wrong,What solved my problem was I reinstalled Ubuntu20.04 again