printing DHL postage stamp

If you want to make a test print with acroread (i.e. to print a DHL postage stamp)
and you get the error message "lp: The printer or class was not found"
then set up the default printer to have the name "undefined".
You can do this via hp-setup -a. Only if it looks like this:
linux>lpq
undefined is ready
no entries
linux>

then you can print.