Setup of HP ScanJet Pro 2000 s2 on Ubuntu 18.04 fails

For diagnostic purposes please provide the output that you receive for the following commands:

uname -a
lsb_release -crid
apt-cache policy python-opencv python3-opencv
sudo -H pip2 install opencv-python

Hi Manfred,

following the requested informations.
Thanks for your interest!
Klaus

uname -a:

Linux acer-3 5.4.0-65-generic #73~18.04.1-Ubuntu SMP Tue Jan 19 09:02:24
UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

lsb_release -crid:

Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic

apt-cache policy python-opencv python3-opencv:

python-opencv:
   Installiert: (keine)
   Installationskandidat: 3.2.0+dfsg-4ubuntu0.1
   Versionstabelle:
      3.2.0+dfsg-4ubuntu0.1 500
         500 http://de.archive.ubuntu.com/ubuntu bionic-updates/universe
amd64 Packages
         500 http://security.ubuntu.com/ubuntu bionic-security/universe
amd64 Packages
      3.2.0+dfsg-4build2 500
         500 http://de.archive.ubuntu.com/ubuntu bionic/universe amd64
Packages
python3-opencv:
   Installiert: 3.2.0+dfsg-4ubuntu0.1
   Installationskandidat: 3.2.0+dfsg-4ubuntu0.1
   Versionstabelle:
  *** 3.2.0+dfsg-4ubuntu0.1 500
         500 http://de.archive.ubuntu.com/ubuntu bionic-updates/universe
amd64 Packages
         500 http://security.ubuntu.com/ubuntu bionic-security/universe
amd64 Packages
         100 /var/lib/dpkg/status
      3.2.0+dfsg-4build2 500
         500 http://de.archive.ubuntu.com/ubuntu bionic/universe amd64
Packages

sudo -H pip2 install opencv-python:

DEPRECATION: Python 2.7 reached the end of its life on January 1st,
2020. Please upgrade your Python as Python 2.7 is no longer maintained.
pip 21.0 will drop support for Python 2.7 in January 2021. More details
about Python 2 support in pip can be found at
https://pip.pypa.io/en/latest/development/release-process/#python-2-support
pip 21.0 will remove support for this functionality.
Collecting opencv-python
   Using cached opencv-python-4.3.0.38.tar.gz (88.0 MB)
   Installing build dependencies ... done
   Getting requirements to build wheel ... error
   ERROR: Command errored out with exit status 1:
    command: /usr/bin/python
/usr/local/lib/python2.7/dist-packages/pip/_vendor/pep517/_in_process.py
get_requires_for_build_wheel /tmp/tmpgSLu28
        cwd: /tmp/pip-install-xwAT3B/opencv-python
   Complete output (22 lines):
   Traceback (most recent call last):
     File
"/usr/local/lib/python2.7/dist-packages/pip/_vendor/pep517/_in_process.py",
line 280, in <module>
       main()
     File
"/usr/local/lib/python2.7/dist-packages/pip/_vendor/pep517/_in_process.py",
line 263, in main
       json_out['return_val'] = hook(**hook_input['kwargs'])
     File
"/usr/local/lib/python2.7/dist-packages/pip/_vendor/pep517/_in_process.py",
line 114, in get_requires_for_build_wheel
       return hook(config_settings)
     File
"/tmp/pip-build-env-xUjDA3/overlay/lib/python2.7/site-packages/setuptools/build_meta.py",
line 146, in get_requires_for_build_wheel
       return self._get_build_requires(config_settings,
requirements=['wheel'])
     File
"/tmp/pip-build-env-xUjDA3/overlay/lib/python2.7/site-packages/setuptools/build_meta.py",
line 127, in _get_build_requires
       self.run_setup()
     File
"/tmp/pip-build-env-xUjDA3/overlay/lib/python2.7/site-packages/setuptools/build_meta.py",
line 243, in run_setup
       self).run_setup(setup_script=setup_script)
     File
"/tmp/pip-build-env-xUjDA3/overlay/lib/python2.7/site-packages/setuptools/build_meta.py",
line 142, in run_setup
       exec(compile(code, __file__, 'exec'), locals())
     File "setup.py", line 448, in <module>
       main()
     File "setup.py", line 99, in main
       % {"ext": re.escape(sysconfig.get_config_var("EXT_SUFFIX"))}
     File "/usr/lib/python2.7/re.py", line 210, in escape
       s = list(pattern)
   TypeError: 'NoneType' object is not iterable
   ----------------------------------------
ERROR: Command errored out with exit status 1: /usr/bin/python
/usr/local/lib/python2.7/dist-packages/pip/_vendor/pep517/_in_process.py
get_requires_for_build_wheel /tmp/tmpgSLu28 Check the logs for full
command output.

"Tried to install opencv-python with apt but it's not in the repositories."

It is named python-opencv in the Ubuntu repositories.

Installed "python-opencv" manually because the script
"hplip-3.20.11.run" tries to install "opencv-python" which is the wrong
name.

I don't remember all steps I did, but got an error which told me to
install "hp-plugin" manually which gave the following error:

"Plugin installation failed
error: Python gobject/dbus may be not installed
error: Plug-in install failed."

I should mention, that I had to plugin the scanner into an USB 2.0 port,
because with USB 3.0 there was no reaction plugging in and out.

The scanner still not is recognized. Further help would be appreciated.
Klaus

Am 06.02.21 um 15:25 schrieb Manfred Hampl:
> Your question #695389 on HPLIP changed:
> https://answers.launchpad.net/hplip/+question/695389
>
> Status: Open => Answered
>
> Manfred Hampl proposed the following answer:
> "Tried to install opencv-python with apt but it's not in the
> repositories."
>
> It is named python-opencv in the Ubuntu repositories.
>

You can manually download the plugin installer from https://developers.hp.com/hp-linux-imaging-and-printing/plugins and then install the pluging with the command "sh hplip-3.20.11-plugin.run" (change the number if applicable, has to be the same as the HPLIP installation that yo already have).