The best way to do this would be to print the confirmation as a PDF document, a sort of electronic printout you can save and use anywhere. On Windows, I use the excellent PDF-Creator which does the job admirably. Having this installed means I can print emails and web pages as PDF documents giving me electronic confirmations of web purchases when I make them (so much easier than paper copies)
You cannot easily do the same on Ubuntu. However, getting the same ability to print to PDF is not difficult and only means you need to load a specific printer type. I've provided a list of instructions you can follow to install PDF printing on Ubuntu.
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