Silent installation console exception

[Rod Widdowson]

That’s not a bug that’s a feature!

Actually it is a bug, just not the one you think it is.  I have entered IDP-2009 to cover it.

You are trying to  install a plugin which has never been installed before and you have not set up a trust store.  The plugin installer doesn't allow you to install untrusted components and so it doesn't proceed.  The bug is that it is a bit brusque about complaining....

If you want to do a silent install of a new plugin (or a plugin with a new key) you have to establish the trust store up front.  [1] gives the details but the TL;DR is that you need to populate 
idp.home/credentials/<pluginId>/truststore.asc with an appropriate key data.  

Plugins produced by the Shibboleth Project are all signed by one of our published keys [2]

Rod

[1] https://shibboleth.atlassian.net/wiki/spaces/IDP4/pages/1294074003/PluginInstallation#GPG-Trust
[2] http://shibboleth.net/downloads/PGP_KEYS