Ubuntu: Can connect to only some networks after update 14.10


I'm using Lubuntu 14.10 on my Macbook 3,1. I'm using the only available Airport driver bcmwl-kernel-source and it is working fine. I can connect to most networks, but not to all. Strangely enough I can wirelessly connect to my personally managed routers I installed at home, but not to those that are installed by others, like the router installed by my ISP at home or the routers at my uni.

So I would love to connect to all networks, but I can't seem to pinpoint the problem. I can connect to all those networks fine with my android smartphone, so for now I'm just USB tethering the connection, but it would be much better if I could connect directly.

I had troubles with wifi before as asked here and at that time the answer worked fine. I could connect to any wifi network, but after updating to 14.10, I tried this again and the only thing it did was remove my wifi functionality.

Does anybody know what the problem might be in 14.10 and how I can connect to all wifi networks?



sudo apt-get purge bcmwl-kernel-source  sudo apt-get install firmware-b43-installer  


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