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Your EPUB Is Fine. Kobo Disagrees. Blame Adobe - André Klein Dot Net
(andreklein.net)
This is a most excellent place for technology news and articles.
I banged my head on this four many hours and couldn’t get it to work directly in Linux. The key issue seemed to be that ADE and Kobo had to be installed on the same device, so I’ve resorted to using a Windows VM (VirtualBox). It works fine enough.
libgourou has no need for anything that has to do with Kobo. It's really only three cli commands: activate (once), download acsm, de-drm. It produces an unencrypted .epub that you can open as is or copy to your Kobo device with any ordinary file operation.