We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Why won't my manuscript convert to EPUB?
Maybe I'm missing something but no matter what I do my file is converted to a pdf rather than epub file. Could it be because I am only distributing through the Lulu marketplace? I can't select the other options because my book isn't in English. I tried uploading my book as doc, docx and rtf file but I still end up with a pdf file.