As far as I can find out it is supported on Linux (at least the release notes don't mention it isn't supported).
What version of NX?
Does the $UGII_BASE_DIR/nxplot/bin/pdf/ exist on your system?
Did you install all the options when you installed NX?
It is an old NX6 version, but we will install NX8.5 soon and I'll make sure that all the options will be installed.
The $UGII_BASE_DIR/nxplot/bin/pdf Folder does not exist on my system