Add a virtual PDF printer to Ubuntu or other Linux. Just install cups-pdf.

In Ubuntu 9.10 Karmic Koala:

1. Install cups-pdf by running the following in the Terminal:
   
   Code:

   sudo apt-get install cups-pdf

2. Go to "System" -> "Printing" and hit the New button.
3. Select "Generic CUPS-PDF printer" and hit the "Forward" button.
4. Hit the "Apply" button.

Now you can print your documents into a PDF file. The PDF file will be placed into the "PDF" folder in your home directory.