Installing a TIG stack on Ubuntu 18.04 involves navigating to the Linux server environment where system admins can access better data about their servers. The TIG stack, consisting of Telegraf, InfluxDB, and Grafana, is being presented as an admin-friendly option for collecting and visualizing server data. To begin, users must update and upgrade their Ubuntu installation before installing the necessary components, including a database, data collection software, and visualization tools. Once installed, users can set up their data source and create a dashboard to visualize their data in a more meaningful way.