CUPS the server will never be installed on an Odoo.sh machine.
That being said you can use a remote printer with a cups client.
The problem lays in the sorry state of libcups dependencies so we will
try to get a reliable section in the documentation for 20.04 as soon as
we can get a testcase.
Meanwhile, it has been reported that the command line `lp` cups cli
client tool could be used as a workaround in the OCA concerned module:
https://gist.github.com/rm-jamotion/0453e91ff3e13350a1e46a11ebb02e8d
Reapply of https://github.com/odoo/documentation-user/commit/3b4c795
===========================
End-user Odoo documentation
===========================
Build the documentation
=======================
Requirements
------------
- `Git <https://www.odoo.com/documentation/user/contributing/documentation/introduction_guide.html#install-git>`_
- | `Python 3 <https://www.odoo.com/documentation/user/contributing/documentation/introduction_guide.html#python>`_
| If you don't know which subversion to choose, pick the last one.
| Python dependencies are listed in the file ``requirements.txt`` located in the root
directory.
- Sphinx 2.4.0 or above.
- Werkzeug 0.14.1
- `Make <https://www.odoo.com/documentation/user/contributing/documentation/introduction_guide.html#make>`_
Instructions
------------
In a terminal, navigate to the root directory and execute the following command:
.. code-block:: console
$ make html
This compiles the documentation to HTML.
Open ``documentation-user/_build/html/index.html`` in your web browser to display the render.
See `this guide
<https://www.odoo.com/documentation/user/contributing/documentation/introduction_guide.html#prepare-your-version>`_
for more detailed instructions.
Contribute to the documentation
===============================
For contributions to the content of the documentation, please refer to the `Introduction Guide
<https://www.odoo.com/documentation/user/contributing/documentation/introduction_guide.html>`_.
To **report a content issue**, **request new content** or **ask a question**, use the `repository's
issue tracker <https://github.com/odoo/documentation-user/issues>`_ as usual.
Learn More
==========
To learn more about Odoo, in addition to the documentation, have a look at `the official eLearning
<https://odoo.com/slides>`_ and `Scale-up, The Business Game
<https://www.odoo.com/page/scale-up-business-game>`_