I do know that according to your error message [isfrozen: False] you do not seem to be running the version that came from Kovid, but are instead using a distro calibre.
It is generally recommended to use the official calibre build. Most distros do not update as frequently as calibre does (weekly) and Kovid prefers to have one self-contained package to support.
The plugin does work on linux -- I use it.
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