↑ ↑ ↑ ✔
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I'm moving this out of the Plugins sub-forum into the Viewer sub-forum.
I suggest the OP installs the current calibre version for Linux from here ==>>
calibre - Download for Linux
Addendum - I'm going tp merge this thread with a duplicate post I found in Devices, which I've already moved the main Calibre forum
@Prof_Hari_Seldon - see ==>>Guideline #3
BR