What Ubuntu version Zorin OS 16.3 Pro?

Found website for "ocrmypdf:
Download "packages":
Ubuntu 20.04 package 9.6.0
and/or
Ubuntu 22.04 package 13.4.0

Which one?
thanks,
John
p.s. Then "terminal"(?) and: apt install ocrmypdf

The Ubuntu Base is Ubuntu 20.04

Yes, the terminal command would be

sudo apt install ocrmypdf

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Umm...
that's it? (or, does something needs to be downloaded first?)
thanks,
John

That command should work.
You may need too check language packs. See more here:

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Or just use Synaptic Package Manager:

i used ocrmypdf extensively for work during lockdown and carried on working from home after until my retirement. Please be aware that if a pdf is comprised of images it may not extract the text. You also need to learn the commands to use it in the terminal as it is a terminal application.

I prepared an information document for anyone wanting to modify documents for students with low vision/no vision before I retired, using only GNU/Linux. The document can be found here:

The manpage of ocrmypdf on ubuntu should also be studied:

https://manpages.ubuntu.com/manpages/focal/en/man1/ocrmypdf.1.html

Sometimes parts of pdf's are images and sometimes, but not always,

ocrmypdf --force-ocr

helped achieve the required result. This and other commands on the manpages of ubuntu link provided.

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