Install golang-gopkg-juju-environschema.v1-dev by entering the following commands in the terminal:
sudo apt update sudo apt install golang-gopkg-juju-environschema.v1-dev
Description:
schema descriptions for Juju environment configurations
This package allows the specification of Juju environment config schema.
Homepage: https://github.com/juju/environschema
Version: 0.0~git20151104.7359fc7-4
Section: universe/devel