This plug-in creates a cover image for documents missing one, using the first page of a PDF file associated to the 856$u subfield.
This plug-in requires Koha 17.05 or higher.
To convert PDF files into images, this plug-in uses the pdftocairo binary, found in the libcairo2-dev package. This plug-in will not run without this package installed.
On Ubuntu/Debian :
sudo apt-get install libcairo2-dev