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There is no real workaround as such, you need to either specify a more common font which is more likely to be available, or you have to place your text in an image - but the second suggestion is only viable for small sections of text, not the whole page.
You can define a series of preferred fonts via CSS, and the browser will use the first available one on the list. For example:
p {font-family:"Greeting Monotone", "Lucida Sans Unicode", Verdana, Arial, sans-serif;}