Jean-Paul, Glyph, thank you very much for your help! The problem is solved now! :)
I should point out here that you should not modify your operating system like this. If /usr/ is managed with 'apt', then let it do that; 'pip' and 'apt' can't manage the same files without stomping on each other. Better would be to create a virtualenv for your application and 'pip install Twisted[tls,http2]' in there.
Thank you Glyph for advice, I'm new to Linux and can do bad things with OS... :)
--
Kind regards, Roman Mescheryakov
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