How to install Wireless - Acer Aspire ONE 759 in Ubuntu

I had no wireless connection with my Acer Aspire One 756, Intel Pentium 997 and Broadcom wireless.
This works for me:

sudo apt-get install linux-headers-generic
sudo apt-get install --reinstall bcmwl-kernel-source

Used this:
EDIMAX EW-7811UN Wireless USB Adapter, 150 Mbit/s, IEEE802.11b/g/n

Acer Aspire one 756 29,5 cm (11,6 Zoll, matt) Netbook (Intel Pentium 987, 1,5GHz, 4GB RAM, 500GB HDD, Intel HD, kein Betriebssystem) blau