Restart MSSQL Server on Linux (Ubuntu).

Microsoft is recommend do that like this:

-- Get service state
sudo systemctl status mssql-server

-- Stop service
sudo systemctl stop mssql-server

-- Start service
sudo systemctl start mssql-server

-- Restart service
sudo systemctl restart mssql-server

For Ubuntu I am prefer restart service by this method:

service mssql-server status
service mssql-server stop
service mssql-server start
service mssql-server restart