Those other GNU/Linux you have used were relying on a Linux kernel that includes some proprietary drivers and firmware (such as the kernel released by Linus Torvalds himself). A blob was responsible for your Wifi card functioning (and, who knows?, spying on you, opening a backdoor, etc.). Trisquel, like any 100% free distribution, uses the Linux-libre kernel where every blob is removed.

The recommended solution is to acquire a new Wifi card that perfectly works with Linux-libre. It is not a simple task as a same model can actually have some cards with a freedom-friendly chipset and some other cards with a chipset requiring a proprietary firmware. The only 100% sure way to freedom-friendly hardware (besides going from seller to seller testing the hardware one by one until finding one that works on your Trisquel laptop), is to buy it from ThinkPenguin. ThinkPenguin is the only seller that guarantees that every device it sells works with Linux-libre, hence Trisquel. Besides, by using the link I have just given, 25% of the benefits on your purchase are donated to the Trisquel project.

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