python 3.8.3
https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa
http://ppa.launchpad.net/deadsnakes/ppa/ubuntu/pool/main/p/python3.8

libpython3.8_3.8.3-1+xenial1_i386.deb
libpython3.8-minimal_3.8.3-1+xenial1_i386.deb
libpython3.8-stdlib_3.8.3-1+xenial1_i386.deb
libpython3.8-testsuite_3.8.3-1+xenial1_all.deb

python3.8_3.8.3-1+xenial1_i386.deb
python3.8-minimal_3.8.3-1+xenial1_i386.deb
python3.8-tk_3.8.3-1+xenial1_i386.deb
python3.8-venv_3.8.3-1+xenial1_i386.deb
python3.8-distutils_3.8.3-1+xenial1_all.deb
python3.8-doc_3.8.3-1+xenial1_all.deb
python3.8-examples_3.8.3-1+xenial1_all.deb
python3.8-gdbm_3.8.3-1+xenial1_i386.deb
python3.8-lib2to3_3.8.3-1+xenial1_all.deb
idle-python3.8_3.8.3-1+xenial1_all.deb

libpython3.8-dev_3.8.3-1+xenial1_i386.deb
python3.8-dev_3.8.3-1+xenial1_i386.deb

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.5 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 2
sudo update-alternatives --config python3

sudo apt install build-essential autoconf automake libtool pkg-config nasm libavcodec-dev libavformat-dev libavutil-dev libass-dev
sudo apt install libffms2-4
sudo apt install imagemagick libtesseract-dev (not working)

cython 0.29.20 (python 3.8)
https://github.com/cython/cython/releases
sudo apt purge cython cython3
cd cython
sudo python3.8 setup.py install
cd ~
cython
cd /usr/local/bin
sudo cp cython cython3
sudo cp cygdb cygdb3
sudo cp cythonize cythonize3

zimg 2.9.3
https://github.com/sekrit-twc/zimg/releases
cd zimg
./autogen.sh
./configure
make
sudo make install

vapoursynth 50 (python 3.8)
https://github.com/vapoursynth/vapoursynth/releases
https://www.svp-team.com/wiki/SVP:Linux
cd vapoursynth
./autogen.sh
./configure
make
sudo make install
sudo ldconfig
sudo ln -s /usr/local/lib/python3.8/site-packages/vapoursynth.so /usr/lib/python3.8/lib-dynload/vapoursynth.so
sudo ln -s /usr/lib/i386-linux-gnu/libffms2.so.4.0.0 /usr/local/lib/vapoursynth/libffms2.so
cd ~
vspipe --version
sudo update-alternatives --config python3

sudo apt install ccache re2c

meson 0.54.2 (python 3.5)
https://github.com/mesonbuild/meson/releases
sudo apt purge meson
sudo update-alternatives --config python3
python3 --version
rm -rd .ccache
cd meson
python3 ./setup.py build
sudo python3 ./setup.py install
sudo python3 ./setup.py bdist
cd ~
meson

ninja 1.10.0 (python 3.5)
https://github.com/ninja-build/ninja/releases
sudo apt purge ninja-build
python3 --version
rm -rd .ccache
cd ninja
python3 ./configure.py --bootstrap
sudo cp ninja /usr/local/bin/ninja
cd ~
ninja

nasm 2.14.02
https://nasm.us
https://nasm.us/pub/nasm/releasebuilds/2.14.02/nasm-2.14.02.tar.gz
sudo apt build-dep nasm
sudo apt purge nasm
cd nasm
./autogen.sh
./configure
make
make strip
sudo make install
cd ~
nasm
ndisasm

havsfunc
https://github.com/HomeOfVapourSynthEvolution/havsfunc
http://forum.doom9.org/showthread.php?t=166582
http://deb-multimedia.org/dists/unstable/main/binary-amd64

https://raw.githubusercontent.com/HomeOfVapourSynthEvolution/havsfunc/master/havsfunc.py
https://raw.githubusercontent.com/HomeOfVapourSynthEvolution/mvsfunc/master/mvsfunc.py
https://raw.githubusercontent.com/mawen1250/VapourSynth-script/master/nnedi3_resample.py
https://raw.githubusercontent.com/dubhater/vapoursynth-adjust/master/adjust.py

havsfunc.py 24 May 2020
mvsfunc.py 19 Jul 2019
nnedi3_resample.py 10 May 2017
adjust.py 22 Mar 2015
Web Archive saved 12 Jun 2020
copy to /usr/local/lib/python3.8/dist-packages

vapoursynth-mvtools 23 (python 3.5)
https://github.com/dubhater/vapoursynth-mvtools/releases
sudo apt install libfftw3-3 libfftw3-bin libfftw3-double3 libfftw3-long3 libfftw3-single3 libfftw3-quad3 libfftw3-dev
rm -rd .ccache
cd vapoursynth-mvtools
mkdir build
cd build
meson ../
ninja
sudo cp libmvtools.so /usr/local/lib/vapoursynth/libmvtools.so
cd ~
rm -rd .ccache

vapoursynth-nnedi3 12 (python 3.5)
https://github.com/dubhater/vapoursynth-nnedi3/releases
sudo apt install yasm
cd vapoursynth-nnedi
./autogen.sh
./configure
make
sudo make install
sudo mv /usr/local/lib/libnnedi3.so /usr/local/lib/vapoursynth/libnnedi3.so
sudo mv /usr/local/lib/libnnedi3.la /usr/local/lib/vapoursynth/libnnedi3.la
sudo nano /usr/local/lib/vapoursynth/libnnedi3.la (libdir='/usr/local/lib/vapoursynth')

vapoursynth-znedi3 1 (python 3.5)
https://github.com/sekrit-twc/znedi3
git clone --recursive https://github.com/sekrit-twc/znedi3
cd znedi
make X86=1
sudo cp vsznedi3.so /usr/local/lib/vapoursynth
sudo cp nnedi3_weights.bin /usr/local/lib/vapoursynth

vapoursynth-ttempsmooth 3.1 (python 3.5)
https://github.com/HomeOfVapourSynthEvolution/VapourSynth-TTempSmooth/releases
cd vapoursynth-ttempsmooth
./autogen.sh
./configure
make
sudo make install
sudo mv /usr/local/lib/libttempsmooth.so /usr/local/lib/vapoursynth/libttempsmooth.so
sudo mv /usr/local/lib/libttempsmooth.la /usr/local/lib/vapoursynth/libttempsmooth.la
sudo nano /usr/local/lib/vapoursynth/libttempsmooth.la (libdir='/usr/local/lib/vapoursynth')

vapoursynth-temporalsoften2 1 (python 3.5)
https://github.com/dubhater/vapoursynth-temporalsoften2/releases
rm -rd .ccache
cd vapoursynth-temporalsoften
mkdir build
cd build
meson ..
ninja
sudo cp libtemporalsoften2.so /usr/local/lib/vapoursynth/libtemporalsoften2.so
cd ~
rm -rd .ccache

fmtconv 22 (python 3.5)
https://github.com/EleonoreMizo/fmtconv/releases
cd fmtconv/build/unix
./autogen.sh
./configure
make
sudo make install
sudo mv /usr/local/lib/libfmtconv.so /usr/local/lib/vapoursynth/libfmtconv.so
sudo mv /usr/local/lib/libfmtconv.la /usr/local/lib/vapoursynth/libfmtconv.la
sudo nano /usr/local/lib/vapoursynth/libfmtconv.la (libdir='/usr/local/lib/vapoursynth')