Welcome to LQ!
Since Dell almost always uses Broadcom chipsets in their wireless cards, would you mind posting the output of lspci so we can double-check on the chipset? It could be that the orinoco_cs drivers aren't the right ones (although if they worked on previous versions of Ubuntu, I might be wrong).
The orinoco_cs driver has been part of the kernel for a bit, so it is likely already installed on your computer. Can I ask why you think they aren't?
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