If you see a Systemd error when trying to start Artifactory, first make sure this is a real error. Sometimes an upgrade will cause your Linux Systemd to report an error when the Tomcat server started anyway:
Check for the exact reason via the recommended journalctl -xe command. Running both of the commands above and reviewing the output(s) produced may indicate a clear error, such as a Linux permission problem.
You can also try checking for the presence of your Java/Artifactory PID:
ps aux | grep artifactory
[Expected output on a running Artifactory] 
If the PID is not present, then there's likely a problem with your service installation (Artifactory Systemd scripts). If yours is a Zip installation, try rerunning the $ART_HOME/bin/installService.sh script.
If none of the steps above help (or yours is an RPM or Debian installation), the problem has been identified as a systemD error. You can can bypass the systemD to continue the upgrade. To proceed, you'll want to manually start Artifactory by going to the bin folder (/opt/jfrog/artifactory/bin in RPM and Debian installations) and triggering the artifactoryManage.sh script:
sudo systemctl start artifactory Job for artifactory.service failed because the control process exited with error code. See "systemctl status artifactory.service" and "journalctl -xe" for details.
You can also try checking for the presence of your Java/Artifactory PID:
ps aux | grep artifactory
[Expected output on a running Artifactory]
If the PID is not present, then there's likely a problem with your service installation (Artifactory Systemd scripts). If yours is a Zip installation, try rerunning the $ART_HOME/bin/installService.sh script.
If none of the steps above help (or yours is an RPM or Debian installation), the problem has been identified as a systemD error. You can can bypass the systemD to continue the upgrade. To proceed, you'll want to manually start Artifactory by going to the bin folder (/opt/jfrog/artifactory/bin in RPM and Debian installations) and triggering the artifactoryManage.sh script:
./bin/artifactoryManage.sh start +++ dirname ./bin/artifactoryManage.sh ++ cd ./bin ++ pwd [... A lot of debug output is printed to standard out …] + '[' 1 -eq 0 ']' + echo 'Artifactory Tomcat started in normal mode' Artifactory Tomcat started in normal mode + exit 0