We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Difficulty getting PDF printed - out of my technical expertise.
I submitted the PDF of my graphic novel as a single, admittedly quite large file (1.4GB) for printing. However, it seems like there is an error with the file. The email back from Lulu's helpful staff stated:
"The problem is stemming from the interior file, "Overkill_Total_Combined.pdf". It is possible that the large file size (1.4 GB) is causing the print software to timeout. We recommend exporting your PDF with our job options settings applied (see linked help articles below)."
I do not have the technical capabilities to understand/figure out how to apply Lulu's job options. If anyone could give me some layman's guidance that would be great.