SQL Server on Linux doesn't support Ubuntu 18.04 LTS. Why weren't Microsoft ready for the next LTS release?
In this post, Pinakin Patel looks at the preliminary steps you need to peform to build an instance in AWS to run SQL Server on Red Hat Linux.
With SQL Server now supported on Linux, traditional SQL Server DBAs will need to learn how to work with Linux, and Linux administrators will need to learn how to work with SQL Server. Fortunately, there are several tools available to assist. In this article Prashanth Jayaram describes how to work with the DMV tool which treats queries as files.