I'm running Mint 17.2 which switched to following Ubuntu LTS releases only. So, I haven't tried a newer Ubuntu, but the wifi is terrible in Win8 too. The "Panda Ultra 150Mbps Wireless N USB Adapter" http://www.amazon.com/gp/product/B00762YNMG was my solution for a massive range/reliability increase.

Related: This screen protector makes the glossy display usable outside: http://www.amazon.com/gp/product/B00HDTVJKQ

I'm really happy to see the Librem 13 nearing existence, but it's not ideal for me: i5 only, no back-lit keyboard. Up to 16GB and the matte screen is awesome though. The X1 Carbon 1st/3rd Gens are great, but Lenovo is being so bad recently.