Ah, right…
Look in ~/.ignition/clientlauncher-data/clientlauncher.log
You’ll see a line like this:
INFO [ClientLauncherFrame ] [12:40:57,735]: Starting Java with the following parameters:nohup /usr/lib/jvm/java-9-jdk/bin/java -classpath /home/kevin/.ignition/clientlauncher-data/launchclient.jar -Djavaws.sr.gateway.addr.0=10.10.70.68:8088/main -Djavaws.sr.scope=D -Djavaws.sr.launchts=1545079238938 -Djavaws.sr.main=com.inductiveautomation.ignition.designer.DesignerStartupHook -Djavaws.sr.platform.edition= -Xms256M -Xmx1024M -Dsun.java2d.d3d=false com.inductiveautomation.ignition.client.launch.BootstrapSwing &
Copy that launch command and launch a client yourself from a terminal. You should be able to see the logs.