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I'd be skeptical that this is a hardware defect. It sounds more like a bug.

Dell is a PITA. The company has started locking down the mini pcie slot so the wifi card from ThinkPenguin may or may not work. If it is an older Dell there is a much higher chance of success.
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Trisquel removed 'bad' software. That might be why you had problems. The solution is not to use 'bad' software. The solution is to take into consideration what hardware you buy in the future.
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There are many problems with NVIIDA and ATI drivers. AMD has done an extremely poor job and we don't have all the code needed to produce a truly free driver.

Intel graphics aren't as powerful...

It's actually a great card although not for your use. It's not recommended over the G USB adapter for most users. It is only really recommended for use in setting up wireless access points.

I'd...