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

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to hplip in Ubuntu.
https://bugs.launchpad.net/bugs/1879206

Title:
  cups hplip not install printer

Status in cups package in Ubuntu:
  New
Status in hplip package in Ubuntu:
  Incomplete

Bug description:
  After upgrading to Ubuntu 20.04 I can't print anymore.

  Description:  Ubuntu 20.04 LTS
  Release:      20.04

  cups:
    Installato: 2.3.1-9ubuntu1.1
    Candidato:  2.3.1-9ubuntu1.1
    Tabella versione:
   *** 2.3.1-9ubuntu1.1 500
          500 http://it.archive.ubuntu.com/ubuntu focal-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu focal-security/main amd64 
Packages
          100 /var/lib/dpkg/status
       2.3.1-9ubuntu1 500
          500 http://it.archive.ubuntu.com/ubuntu focal/main amd64 Packages

  hplip:
    Installato: 3.20.3+dfsg0-2
    Candidato:  3.20.3+dfsg0-2
    Tabella versione:
   *** 3.20.3+dfsg0-2 500
          500 http://it.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status

  
  I tried to reinstall the printer, but it is not being re-saved by cups / hplip

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: cups 2.3.1-9ubuntu1.1
  ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
  Uname: Linux 5.4.0-29-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Mon May 18 02:24:07 2020
  InstallationDate: Installed on 2020-05-17 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  Lpstat: device for DeskJet_3630: 
hp:/usb/DeskJet_3630_series?serial=CN8AM7H3230658
  MachineType: LENOVO 80G0
  Papersize: a4
  PpdFiles: Error: command ['fgrep', '-H', '*NickName', 
'/etc/cups/ppd/DeskJet_3630.ppd'] failed with exit code 2: grep: 
/etc/cups/ppd/DeskJet_3630.ppd: Permission denied
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-29-generic 
root=UUID=6a8469e0-ecea-4a86-8040-b0caaa938fe4 ro quiet splash vt.handoff=7
  SourcePackage: cups
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/18/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: A7CN40WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: Lancer 5A6
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0F82993WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo G50-30
  dmi.modalias: 
dmi:bvnLENOVO:bvrA7CN40WW:bd07/18/2014:svnLENOVO:pn80G0:pvrLenovoG50-30:rvnLENOVO:rnLancer5A6:rvrSDK0F82993WIN:cvnLENOVO:ct10:cvrLenovoG50-30:
  dmi.product.family: IDEAPAD
  dmi.product.name: 80G0
  dmi.product.sku: LENOVO_MT_80G0_BU_idea_FM_Lenovo G50-30
  dmi.product.version: Lenovo G50-30
  dmi.sys.vendor: LENOVO

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