@joffling: The main issue was an old (and bugged) version of wpad. Currently, I have version 2016-01-15-2 and that works.
As for the precise way… hmmm… it’s been some time. If I recall correctly, you need to uninstall ‘wpad-mini’ and install ‘wpad’ through the advanced menu under software. As said above, you need at least version 2016-01-15-2 for wpa2 to work properly for eduroam. Then with that you simply enter your credentials and security settings according to the howto for setting up eduroam that your university provides. Usually the version for android or linux tells you the actual settings instead of providing a setup wizard. For me it was WPA2-EAP, TTLS, MSCHAPV2, ‘auto’ for cipher (not sure about this one) for security settings.
Hope that helps you set it up.