Installing avisynth on Ubuntu 16.04

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I have installed hybrid according to the instructions provided on https://forum.selur.net/showthread.php?tid=18 on Ubuntu 16.04

I cannot figure out how to install the avisynthExtension_180127.7z package downloaded from http://www.selur.de/downloads. There is no avisynth tab no matter what I do.

I want to convert videos to a higher framerate. I am assuming that vapoursynth does not support this. Any help is appreciated.