In the sign up page (https://www.microsoft.com/en-us/server-cloud/sql-server-on-linux.aspx https://www.microsoft.com/en-us/server-cloud/sql-server-on-l...) you'

In the sign up page (https://www.microsoft.com/en-us/server-cloud/sql-server-on-linux.aspx https://www.microsoft.com/en-us/server-cloud/sql-server-on-l...) you'll find this quote: "Please note that at this time, SQL Server on Linux is available on Ubuntu or as Docker image." :)