Sorry, I should have been clearer:
IIRC, using Firefox in Xubuntu, I was able to left click on an epub file in Gutenberg, and instead of simply saving the file to my Downloads directory I was offered to save/import to Calibre. I can't remember if it was a Calibre or Firefox plugin or an Xubuntu setting - but it was very convenient.
Thanks for the reply.
Jim
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