MathWorks periodically updates platform support and has made the following changes: 

New Platforms

• Ubuntu 18.10: Support begins with R2019a.

Dropped Platforms

• Windows Server 2012 and 2012 R2: Support has ended as of R2019a.
• Debian 8: Support has ended as of R2019a.

See the complete set of system requirements and the platform road map for the latest information on planned platform changes to MathWorks products.