This has been an issue for sometime until now. I found the following link that help me install SQL Server on the latest Ubuntu 18.04:
But, there are few missing steps which can help ease the burden of errors. At the same time, the information is a little out-dated.
But, it works with the following adjustments.
Please Understand!! This is NOT approved by Microsoft. Use this method for Test Only!!
I’m waiting somewhat impatiently for Microsoft and Hortonworks to support Ubuntu 18.04.