The Ubersmith installer requires Docker and some OS level dependencies to be installed.
Full documentation for the installer can be found here.
This upgrade utility is not compatible with Ubersmith 3.x.
If you have a version of Ubersmith older than 4.6.x, you will need to upgrade to 4.6.4 first before upgrading to 5.0.0 to ensure that you have a compatible version of MySQL which can be upgraded to MySQL 8.