for everyone stumbling over this issue: please see announcement by Kai for reasons/next step etc:
In short: the download server for the bindings and releases been deactivated. In order to upgrade or add bindings the OH version need to be updated. In order to do so via apt-get upgrade the package repository location need to be updated manually:
after that done, an upgrade and a reboot the binding was properly listed (and other bindings can be installed as well)
