I made the following changes:
mv log4j2.xml normal-log4j2.xml
mv debug-log4j2.xml log4j2.xml
Also, I created a file /opt/mango/overrides/properties/env.properties with web.openBrowserOnStartup=false
The startup output is below. The web server does start, and reports 85% progress "Initializing Web Image Set" and displays the contents of logging/ma.log
INFO 2017-08-24T16:09:24,429 (com.serotonin.m2m2.Main.main:90) - Starting Mango 3.2.0+20170807191436 with Schema Version: 17
INFO 2017-08-24T16:09:24,659 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'sstGraphics', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,679 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'watchlists', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,694 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'dataImport', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,696 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'meta', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,699 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'excelReports', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,702 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'mangoApi', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,704 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'mbus', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,707 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'reports', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,709 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'log4JReset', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,710 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'ssh', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,712 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'sqlConsole', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,714 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'virtualDS', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,716 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'pakbus', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,718 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'vmstat', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,721 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'onewire', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,723 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'maintenanceEvents', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,725 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'egauge', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,727 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'loggingConsole', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,729 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'serial', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,730 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'deviceConfig', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,732 (com.serotonin.m2m2.util.DocumentationManifest.parseManifestFile:60) - Documentation manifest file not found: /opt/mango/web/modules/deviceConfig/web/dox/manifest.xml
INFO 2017-08-24T16:09:24,733 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'mangoUI', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,734 (com.serotonin.m2m2.util.DocumentationManifest.parseManifestFile:60) - Documentation manifest file not found: /opt/mango/web/modules/mangoUI/web/dox/manifest.xml
INFO 2017-08-24T16:09:24,752 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'dashboardDesigner', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,753 (com.serotonin.m2m2.util.DocumentationManifest.parseManifestFile:60) - Documentation manifest file not found: /opt/mango/web/modules/dashboardDesigner/web/dox/manifest.xml
INFO 2017-08-24T16:09:24,754 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'jsonFileImport', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,756 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'dataFile', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,760 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'pop3', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,762 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'TCPIP', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,764 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'mqttClientDataSource', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,766 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'asciiFile', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,768 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'Haystack', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,769 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'snmp', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,772 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'envcands', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,774 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'controlcore', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,775 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'scheduledEvents', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,777 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'graphicalViews', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,780 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'dnp3', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,782 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'http', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,785 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'sstGlobalScripts', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,786 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'twilio', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,788 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'sqlds', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,790 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'templateConfig', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,792 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'log4jDS', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,794 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'modbus', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,796 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'BACnet', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,798 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'scripting', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,800 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'opcda', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,800 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'pointLinks', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:24,802 (com.serotonin.m2m2.Main.loadModules:544) - Loading module 'internal', v3.2.0 by Infinite Automation
INFO 2017-08-24T16:09:25,766 (com.serotonin.m2m2.Lifecycle.initialize:192) - Initializing Spring Object Mapper
INFO 2017-08-24T16:09:25,935 (org.eclipse.jetty.util.log.Log.initialized:192) - Logging initialized @2588ms
INFO 2017-08-24T16:09:26,043 (org.eclipse.jetty.server.Server.doStart:345) - jetty-9.3.11.v20160721
INFO 2017-08-24T16:09:26,101 (org.eclipse.jetty.server.AbstractConnector.doStart:270) - Started ServerConnector@c58fd0{HTTP/1.1,[http/1.1, h2c, h2c-17, h2c-16, h2c-15, h2c-14]}{0.0.0.0:8080}
INFO 2017-08-24T16:09:26,103 (org.eclipse.jetty.server.Server.doStart:403) - Started @2757ms
INFO 2017-08-24T16:09:26,177 (org.eclipse.jetty.server.handler.ContextHandler.doStart:781) - Started o.e.j.s.h.ContextHandler@1162e7{/,null,AVAILABLE}
INFO 2017-08-24T16:09:26,236 (com.serotonin.m2m2.Lifecycle.loadLic:508) - Checking license...
INFO 2017-08-24T16:09:26,237 (com.serotonin.m2m2.Lifecycle.loadLic:594) - License file not found
INFO 2017-08-24T16:09:26,345 (com.serotonin.m2m2.db.H2Proxy.initializeImpl:42) - Initializing H2 connection manager
INFO 2017-08-24T16:09:27,276 (com.serotonin.m2m2.db.upgrade.DBUpgrade.checkUpgrade:36) - Starting instance with core version 3.2.0+20170807191436, db 17
INFO 2017-08-24T16:09:27,409 (com.serotonin.m2m2.rt.RuntimeManager.initialize:160) - Starting 0 Publishers...
INFO 2017-08-24T16:09:27,409 (com.serotonin.m2m2.rt.RuntimeManager.initialize:172) - 0 Publisher's started in 1ms
Exception in thread "main" java.lang.UnsatisfiedLinkError: /usr/local/java/jdk1.8.0_144/jre/lib/i386/libawt_xawt.so: libXext.so.6: cannot open shared object file: No such file or directory
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1824)
at java.lang.Runtime.load0(Runtime.java:809)
at java.lang.System.load(System.java:1086)
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1845)
at java.lang.Runtime.loadLibrary0(Runtime.java:870)
at java.lang.System.loadLibrary(System.java:1122)
at java.awt.Toolkit$3.run(Toolkit.java:1636)
at java.awt.Toolkit$3.run(Toolkit.java:1634)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.loadLibraries(Toolkit.java:1633)
at java.awt.Toolkit.<clinit>(Toolkit.java:1668)
at com.serotonin.m2m2.view.ViewGraphicLoader.loadDirectory(ViewGraphicLoader.java:109)
at com.serotonin.m2m2.view.ViewGraphicLoader.loadModuleGraphics(ViewGraphicLoader.java:56)
at com.serotonin.m2m2.view.ViewGraphicLoader.loadViewGraphics(ViewGraphicLoader.java:44)
at com.serotonin.m2m2.Lifecycle.imageSetInitialize(Lifecycle.java:1357)
at com.serotonin.m2m2.Lifecycle.initialize(Lifecycle.java:317)
at com.serotonin.m2m2.Main.main(Main.java:125)
Thank you.