I'm using Debian Mint and my internet has worked everywhere on earth (Home, Mcdonalds, other peoples homes) except at school where I really need it. It will always see the networks and will 'try' to connect but will never be able to do so.
Occasionally it will work if I reboot, and disconnect networking, and reconnect, but only occasionally.
It works perfectly if I dual boot to Windows so it's kinda frustrating.
Power management is off, and Tx power is at 15db.