Sozi not working on Inkscape, Ubuntu 20.04 | ImportError: No module named fields
Solution 1:
The version of Sozi you are trying to install is very outdated. The last version of Sozi that shipped as an Inkscape extension was Sozi 13, released in 2013.
Since 2015, Sozi is a standalone application that runs independently of Inkscape. You can still use Inkscape to create your document, and use Sozi to organize your presentation.
I would advise to install the latest version of Sozi using the instructions from its official website. The recommended place to report issues or discuss about Sozi is the GitHub page of the project