Build and install neovim for Debian

installNeovim.sh

#!/usr/bin/env bash

#Build and install neovim for Debian
#See: https://neovim.io/
#See: https://github.com/neovim/neovim/wiki/Building-Neovim#quick-start

#See: https://gist.github.com/darcyparker/153124662b05c679c417

#Save current dir
pushd . >/dev/null || exit

#Install dependencies
sudo apt-get update
sudo apt-get install -y \
  autoconf \
  automake \
  cmake \
  g++ \
  gettext \
  libncurses5-dev \
  libtool \
  libtool-bin \
  libunibilium-dev \
  libunibilium4 \
  lua5.1 \
  lua5.4 \
  luarocks \
  liblua5.1-0-dev \
  ninja-build \
  pkg-config \
  python3-pip \
  software-properties-common \
  unzip

# Enable use of python plugins
# Note: python neovim module was renamed to pynvim
VENV_DIR="$HOME/.config/nvim/pynvim-venv"
if [ ! -d "$VENV_DIR" ]; then
  python3 -m venv "$VENV_DIR" &>/dev/null
fi
# "$VENV_DIR/bin/pip" install --upgrade setuptools
"$VENV_DIR/bin/pip" install --upgrade pynvim
# In nvim/lua configs:
# -- Define the path to your Neovim virtual environment's bin directory
# local venv_bin_path = vim.fn.expand("~/.config/nvim/pynvim-venv/bin")
#
# -- Prepend the venv bin directory to Neovim's PATH environment variable.
# -- This allows Neovim and its plugins to find executables like 'ueberzugpp'.
# vim.env.PATH = venv_bin_path .. ":" .. vim.env.PATH
#
# vim.g.python3_host_prog = venv_bin_path .. "/python"
unset VENV_DIR

gem install neovim
npm install -g neovim

#Get or update neovim github repo
mkdir -p ~/src
cd ~/src || exit
if [ ! -e ~/src/neovim ]; then
  git clone https://github.com/neovim/neovim
else
  cd neovim || exit
  git pull origin
fi

cd ~/src/neovim || exit
git checkout master

#Remove old build dir and .deps dir
rm -rf build/
rm -rf .deps/
make distclean

# Build and install neovim
make CMAKE_BUILD_TYPE=RelWithDebInfo CMAKE_EXTRA_FLAGS="-DCMAKE_INSTALL_PREFIX=/usr/local/"
make install

# Enable use of ruby plugins
# sudo gem install neovim

#Restore dir
popd >/dev/null || exit

echo "nvim command: $(command -v nvim)"
echo "nvim command: $(ls -al "$(command -v nvim)")"

Just a big thank you @osamuaoki !