In Symantec Endpoint Protection for Linux, versions 14.3 MP1 and earlier, it was possible to manually trigger a LiveUpdate with the command, '/opt/Symantec/symantec_antivirus/sav liveupdate -u'.
In versions 14.3 RU1 and later, this option is missing.
Linux Endpoints with the Symantec Endpoint Protection client installed.
Navigate to /usr/lib/symantec/ on the endpoint and run /stop.sh followed by ./start.sh. The agent will attempt to run LiveUpdate upon start.
The ability to run liveupdate -u is expected to be restored with version 14.3 RU3.