I'm experiencing this bug since the very first builds of 10.5. When trying to upgrade (the no longer working) scala plugin from within 10.5 I get a dialog:
Plugin dependencies detected
The plugin you want to install requires other plugin (Coverage) which have to be installed as well.
But I can't get to this dialog since its blocked by model "Downloading Plugins" dialog.
Also manually installing plugin "Coverage" does not work since I can't find a plugin with this name in the manager.
I'm using Community Edition and running Ubuntu 64 Bit with sun java 6.