Ubuntu 16.04.x LTS. When relevant, this section's text is displayed in red color, as shown in the figure above.
Physical Appliance, or
Hyper-V Appliance. Whether the appliance is locked or unlocked should not make a difference, provided that you have not changed the configuration of an unlocked appliance beyond what automatic upgrade process is expecting.
/var/log/syslogfile will be prefixed with the
Ubuntu 18.04.x LTStext should be displayed.