Unable to start SQL Server on Ubuntu 16.04

SQL Server did not start because the OS did not have 3250MB of memory. Was tracked by below command

journalctl -u mssql-server.service -b

Nov 30 00:43:21 OraServer sqlservr[4075]: 
 sqlservr: This program requires a machine with at least 3250 megabytes of memory.

Memory was added and SQL Server was started:

systemctl status mssql-server