I'll admit this is a little off the wall but if your question is how to fill out the form after you have the pdf you might try this:
Install xournal from synaptic
Open xournal: Menu > Accessories > Xournal
Once opened select File > Annotate PDF
Then Tools > Text ( you can change the text font and size: Tools > Text Font )
When you're done you can File > Export to PDF
The placement of the inserted text can become nerve racking, and if you have a large form with many inserts I guarantee you will search the net for a better alternative. But for small jobs it might be worth a look.
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