I have an Ubuntu 1504 box with HP Photosmart 6520 connected to it.
I successfully managed to declare a custom paper size in the cups printer driver and indeed the new page size is present in the list of HPLIP Device Manager >> Print Settins >> General >> Media Size.
But this new format is not present in the dropdown list I find in Print>>Properties>>Paper Size within LO.
How can I align the two lists of available media?
Thanks in advance,