It looks like the problem I've got since upgrade to 20.04. Had the permission warning to the ppd file as well, but tried to add user to lp group. Here's the current output of my hp-check: hp-check[15036]: info: : hp-check[15036]: info: :HP Linux Imaging and Printing System (ver. 3.20.5) hp-check[15036]: info: :Dependency/Version Check Utility ver. 15.1 hp-check[15036]: info: : hp-check[15036]: info: :Copyright (c) 2001-18 HP Development Company, LP hp-check[15036]: info: :This software comes with ABSOLUTELY NO WARRANTY. hp-check[15036]: info: :This is free software, and you are welcome to distribute it hp-check[15036]: info: :under certain conditions. See COPYING file for more details. hp-check[15036]: info: : hp-check[15036]: info: :Note: hp-check can be run in three modes: hp-check[15036]: info: :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. hp-check[15036]: info: :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. hp-check[15036]: info: :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). hp-check[15036]: info: : hp-check[15036]: info: :Check types: hp-check[15036]: info: :a. EXTERNALDEP - External Dependencies hp-check[15036]: info: :b. GENERALDEP - General Dependencies (required both at compile and run time) hp-check[15036]: info: :c. COMPILEDEP - Compile time Dependencies hp-check[15036]: info: :d. [All are run-time checks] hp-check[15036]: info: :PYEXT SCANCONF QUEUES PERMISSION hp-check[15036]: info: : hp-check[15036]: info: :Status Types: hp-check[15036]: info: : OK hp-check[15036]: info: : MISSING - Missing Dependency or Permission or Plug-in hp-check[15036]: info: : INCOMPAT - Incompatible dependency-version or Plugin-version hp-check[15036]: info: : hp-check[15036]: info: : hp-check[15036]: info: :--------------- hp-check[15036]: info: :| SYSTEM INFO | hp-check[15036]: info: :--------------- hp-check[15036]: info: : hp-check[15036]: info: : Kernel: 5.4.0-29-generic #33-Ubuntu SMP Wed Apr 29 14:32:27 UTC 2020 GNU/Linux Host: panthera Proc: 5.4.0-29-generic #33-Ubuntu SMP Wed Apr 29 14:32:27 UTC 2020 GNU/Linux Distribution: 12 20.04 hp-check[15036]: info: : Bitness: 64 bit hp-check[15036]: info: : hp-check[15036]: info: :----------------------- hp-check[15036]: info: :| HPLIP CONFIGURATION | hp-check[15036]: info: :----------------------- hp-check[15036]: info: : hp-check[15036]: info: :HPLIP-Version: HPLIP 3.20.5 hp-check[15036]: info: :HPLIP-Home: /usr/share/hplip hp-check[15036]: info: :HPLIP-Installation: Auto installation is supported for ubuntu distro 20.04 version hp-check[15036]: info: : hp-check[15036]: info: :Current contents of '/etc/hp/hplip.conf' file: hp-check[15036]: info: :# hplip.conf. Generated from hplip.conf.in by configure. [hplip] version=3.20.5 [dirs] home=/usr/share/hplip run=/var/run ppd=/usr/share/ppd/HP ppdbase=/usr/share/ppd doc=/usr/share/doc/hplip-3.20.5 html=/usr/share/doc/hplip-3.20.5 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=3.20.5 restricted-build=no ui-toolkit=qt5 qt3=no qt4=no qt5=yes policy-kit=no lite-build=no udev_sysfs_rules=no hpcups-only-build=no hpijs-only-build=no apparmor_build=yes class-driver=no hp-check[15036]: info: : hp-check[15036]: info: :Current contents of '/var/lib/hp/hplip.state' file: hp-check[15036]: info: :Plugins are not installed. Could not access file: No such file or directory hp-check[15036]: info: : hp-check[15036]: info: :Current contents of '~/.hplip/hplip.conf' file: hp-check[15036]: info: :[upgrade] notify_upgrade = true last_upgraded_time = 1589454416 pending_upgrade_time = 0 latest_available_version = 3.17.10 [last_used] device_uri = hp:/usb/OfficeJet_6950?serial=TH81R2611Z printer_name = OfficeJet_6950 [installation] date_time = 05/19/20 19:08:59 version = 3.20.5 hp-check[15036]: info: : hp-check[15036]: info: : hp-check[15036]: info: :------------------------- hp-check[15036]: info: :| External Dependencies | hp-check[15036]: info: :------------------------- hp-check[15036]: info: : hp-check[15036]: info: : cups CUPS - Common Unix Printing System REQUIRED 1.1 2.3.1 OK 'CUPS Scheduler is running' hp-check[15036]: info: : gs GhostScript - PostScript and PDF language interpreter and previewer REQUIRED 7.05 9.50 OK - hp-check[15036]: info: : error: xsane xsane - Graphical scanner frontend for SANE OPTIONAL 0.9 - INCOMPAT 'xsane needs to be installed' hp-check[15036]: info: : scanimage scanimage - Shell scanning program OPTIONAL 1.0 1.0.29 OK - hp-check[15036]: info: : dbus DBus - Message bus system REQUIRED - 1.12.16 OK - hp-check[15036]: info: : policykit PolicyKit - Administrative policy framework OPTIONAL - 0.105 OK - hp-check[15036]: info: : network network -wget OPTIONAL - 1.20.3 OK - hp-check[15036]: info: : avahi-utils avahi-utils OPTIONAL - 0.7 OK - hp-check[15036]: info: : hp-check[15036]: info: :------------------------ hp-check[15036]: info: :| General Dependencies | hp-check[15036]: info: :------------------------ hp-check[15036]: info: : hp-check[15036]: info: : libjpeg libjpeg - JPEG library REQUIRED - - OK - hp-check[15036]: info: : cups-devel CUPS devel- Common Unix Printing System development files REQUIRED - 2.3.1 OK - hp-check[15036]: info: : cups-image CUPS image - CUPS image development files REQUIRED - 2.3.1 OK - hp-check[15036]: info: : libpthread libpthread - POSIX threads library REQUIRED - b'2.31' OK - hp-check[15036]: info: : libusb libusb - USB library REQUIRED - 1.0 OK - hp-check[15036]: info: : sane SANE - Scanning library REQUIRED - - OK - hp-check[15036]: info: : sane-devel SANE - Scanning library development files REQUIRED - - OK - hp-check[15036]: info: : libnetsnmp-devel libnetsnmp-devel - SNMP networking library development files REQUIRED 5.0.9 5.8 OK - hp-check[15036]: info: : libcrypto libcrypto - OpenSSL cryptographic library REQUIRED - 1.1.1 OK - hp-check[15036]: info: : python3X Python 2.2 or greater - Python programming language REQUIRED 2.2 3.8.2 OK - hp-check[15036]: info: : python3-notify2 Python libnotify - Python bindings for the libnotify Desktop notifications OPTIONAL - - OK - hp-check[15036]: info: : python3-pyqt5-dbus PyQt 5 DBus - DBus Support for PyQt5 OPTIONAL 5.0 5.14.1 OK - hp-check[15036]: info: : python3-pyqt5 PyQt 5- Qt interface for Python (for Qt version 4.x) REQUIRED 5.0 5.14.1 OK - hp-check[15036]: info: : python3-dbus Python DBus - Python bindings for DBus REQUIRED 0.80.0 1.2.16 OK - hp-check[15036]: info: : python3-xml Python XML libraries REQUIRED - 2.2.9 OK - hp-check[15036]: info: : python3-devel Python devel - Python development files REQUIRED 2.2 3.8.2 OK - hp-check[15036]: info: : python3-pil PIL - Python Imaging Library (required for commandline scanning with hp-scan) OPTIONAL - 7.0.0 OK - hp-check[15036]: info: : python3-reportlab Reportlab - PDF library for Python OPTIONAL 2.0 3.5.34 OK - hp-check[15036]: info: : hp-check[15036]: info: :-------------- hp-check[15036]: info: :| COMPILEDEP | hp-check[15036]: info: :-------------- hp-check[15036]: info: : hp-check[15036]: info: : libtool libtool - Library building support services REQUIRED - 2.4.6 OK - hp-check[15036]: info: : gcc gcc - GNU Project C and C++ Compiler REQUIRED - 9.3.0 OK - hp-check[15036]: info: : make make - GNU make utility to maintain groups of programs REQUIRED 3.0 4.2.1 OK - hp-check[15036]: info: : hp-check[15036]: info: :--------------------- hp-check[15036]: info: :| Python Extentions | hp-check[15036]: info: :--------------------- hp-check[15036]: info: : hp-check[15036]: info: : cupsext CUPS-Extension REQUIRED - 3.20.5 OK - hp-check[15036]: info: : hpmudext IO-Extension REQUIRED - 3.20.5 OK - hp-check[15036]: info: : hp-check[15036]: info: :---------------------- hp-check[15036]: info: :| Scan Configuration | hp-check[15036]: info: :---------------------- hp-check[15036]: info: : hp-check[15036]: info: : hpaio HPLIP-SANE-Backend REQUIRED - 3.20.5 OK 'hpaio found in /etc/sane.d/dll.conf' hp-check[15036]: info: : scanext Scan-SANE-Extension REQUIRED - 3.20.5 OK - hp-check[15036]: info: : hp-check[15036]: info: :------------------------------ hp-check[15036]: info: :| DISCOVERED SCANNER DEVICES | hp-check[15036]: info: :------------------------------ hp-check[15036]: info: : hp-check[15036]: info: :device `hpaio:/usb/OfficeJet_6950?serial=TH81R2611Z' is a Hewlett-Packard OfficeJet_6950 all-in-one hp-check[15036]: info: : hp-check[15036]: info: :-------------------------- hp-check[15036]: info: :| DISCOVERED USB DEVICES | hp-check[15036]: info: :-------------------------- hp-check[15036]: info: : hp-check[15036]: info: : Device URI Model hp-check[15036]: info: : ------------------------------------------------ ------------------------------------------------ hp-check[15036]: info: : hp:/usb/OfficeJet_6950?serial=TH81R2611Z HP OfficeJet 6950 hp-check[15036]: info: : hp-check[15036]: info: :--------------------------------- hp-check[15036]: info: :| INSTALLED CUPS PRINTER QUEUES | hp-check[15036]: info: :--------------------------------- hp-check[15036]: info: : hp-check[15036]: info: : hp-check[15036]: info: :OfficeJet_6950 hp-check[15036]: info: :-------------- hp-check[15036]: info: :Type: Printer hp-check[15036]: info: :Device URI: hp:/usb/OfficeJet_6950?serial=TH81R2611Z hp-check[15036]: info: :PPD: /etc/cups/ppd/OfficeJet_6950.ppd hp-check[15036]: info: :PPD Description: HP Officejet 6950, hpcups 3.20.3 hp-check[15036]: info: :Printer status: printer OfficeJet_6950 is idle. enabled since Čt 14. května 2020, 13:36:55 error: Device not found error: Communication status: Failed hp-check[15036]: info: : hp-check[15036]: info: :OfficeJet_6950_fax hp-check[15036]: info: :------------------ hp-check[15036]: info: :Type: Fax hp-check[15036]: info: :Device URI: hpfax:/usb/OfficeJet_6950?serial=TH81R2611Z hp-check[15036]: info: :PPD: /etc/cups/ppd/OfficeJet_6950_fax.ppd hp-check[15036]: info: :PPD Description: HP Fax4 hpcups hp-check[15036]: info: :Printer status: printer OfficeJet_6950_fax is idle. enabled since Čt 14. května 2020, 12:44:43 error: Device not found error: Communication status: Failed hp-check[15036]: info: : hp-check[15036]: info: : hp-check[15036]: info: :-------------- hp-check[15036]: info: :| PERMISSION | hp-check[15036]: info: :-------------- hp-check[15036]: info: : hp-check[15036]: info: :USB OfficeJet_6950 Required - - OK Node:'/dev/bus/usb/002/005' Perm:' root lp rw- rw- rw- rw- r--' hp-check[15036]: info: : hp-check[15036]: info: :----------- hp-check[15036]: info: :| SUMMARY | hp-check[15036]: info: :----------- hp-check[15036]: info: : hp-check[15036]: info: :Missing Required Dependencies hp-check[15036]: info: :----------------------------- hp-check[15036]: info: :None hp-check[15036]: info: : hp-check[15036]: info: :Missing Optional Dependencies hp-check[15036]: info: :----------------------------- error: 'gtk2-engines-pixbuf' package is missing/incompatible error: 'xsane' package is missing/incompatible hp-check[15036]: info: : hp-check[15036]: info: :Total Errors: 3 hp-check[15036]: info: :Total Warnings: 0 hp-check[15036]: info: : hp-check[15036]: info: : hp-check[15036]: info: :Done.