I would go through the instructions again carefully to reinstall unoconv. Make sure it is the correct versions - my linux distro did not have that automatically and I had to download it from a different repo. You also need to make sure libreoffice is installed and then check that unoconv is working. I also needed to give the www user (linux debian) permissions on the www folder so that moodle could write to it.
Can Teacher see/open the Assignment without having to save it first?
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