Yesterday I upgraded both of my laptop of their respective memory and wifi card. For Lenovo Thinkpad, I upgraded the memory from 4 to 6GB. For Acer Aspire One, I upgraded the wifi device from the nonfree to the free one that I had proven works with Trisquel. Here's how I did it with pictures and some story. Now I can run Ubuntu and other operating systems smoother than ever. 

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