WordPress Theme Dev Setup on Ubuntu VPS with Underscores

I need text file instructions to set up a live WordPress theme development environment on an Ubuntu VPS.

Requirements:
- List all necessary plugins
- Example of wp-config
- List all programs required to create and save the production theme and install commands and commands needed to create production theme file.

Ideal skills and experience:
- Proficiency in WordPress and Ubuntu
- Experience with VPS and theme development
- Familiarity with setting up wp-config and necessary plugins

Please ensure the environment is ready for immediate theme development.