The post outlines the procedure to upgrade Ubuntu Desktop or Server from a previous version, indicating that Ubuntu LTS versions are supported for five years and STS versions are supported for about 9 months. To begin, you must first update all installed packages to their latest versions, then remove any dependencies no longer needed. Then, use the 'do-release-upgrade' command to start the upgrade process, following on-screen instructions and restarting your computer when finished. The content assured that the steps are relatively painless and straightforward.