Requires an api key from openweathermap which you need to create yourself (free tier) in your own account.
Ubuntu
Copy & paste this into your terminal, press enter, then enter your password and wait:
sudo apt -y install git curl cmake meson make clang libgtk-3-dev pkg-config && mkdir -p ~/development && cd ~/development && git clone https://github.com/flutter/flutter.git -b stable && echo 'export PATH="$PATH:$HOME/development/flutter/bin"' >> ~/.bashrc && source ~/.bashrc