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Graphical installers are not supported by the VM - RHEL 7

Having some trouble getting the GUI installer to install OD Receivers on a new RHEL 7 VM where I've had all the necessary 32-bit libraries installed, exported the display to my Windows PC's IP address, and set up my Xwin server to add the VM as an xhost. This same setup worked fine to install TeamSite and OD Base on similar VMs. This is maddening, of course. The only log I can find is in /tmp/installer.log and it seems to be complaining about some Driver:

2018-07-23 05:53:02,513 ERROR com.interwoven.wcm.install.framework.ia.Driver - installation type must not be null
java.lang.IllegalArgumentException: installation type must not be null
at com.interwoven.wcm.install.framework.ComponentSelectionManager.(ComponentSelectionManager.java:159)
at com.interwoven.wcm.install.framework.ia.Driver.preInstallPhase(Driver.java:811)
at com.interwoven.wcm.install.framework.ia.Driver.install(Driver.java:353)
at com.zerog.ia.installer.actions.CustomAction.installSelf(Unknown Source)
at com.zerog.ia.installer.AAMgrBase.an(Unknown Source)

but I don't know if that's a red herring or not. I have a support case open, but I'm wondering if anyone else can suggest what else I might be missing. The contents of the folder I'm running the install from have the main Linux installer bin and the .iwpkg and .mdsum files for the OpenDeploy installs. I'm running the install as root.