I had exactly the same error: unoconv: UnoException during conversion: URL seems to be an unsupported one. The provided document cannot be converted to the desired format.
Installing openoffice.org-java-common and openoffice.org-base-core did not fix it, however, installing openoffice.org-writer did. I needed to install openoffice.org-calc for spreadsheets and openoffice.org-impress for presentations. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org