No Wireless Connection on a Broadcom BCM43227

Question

I´ve installed Ubuntu 11.10 on my Acer Aspire Laptop and can´t get any Wireless connection. Where is my problem? My wireless card is an Acer Nplify(TM) 802.11b/g/n.

Thanks in Advance

@mikewhatever:

nic@ubuntu:~$ lspci -nnk | grep -iA2 net 
Kernel driver in use: tg3 
--
02:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM57785 Gigabit Ethernet PCIe [14e4:16b5] (rev 10) 
    Subsystem: Acer Incorporated [ALI] Device [1025:0504] 

    Kernel driver in use: sdhci-pci 

---

02:00.1 SD Host controller [0805]: Broadcom Corporation NetXtreme BCM57765 Memory Card Reader [14e4:16bc] (rev 10) 
    Subsystem: Acer Incorporated [ALI] Device [1025:0504] 

03:00.0 Network controller [0280]: Broadcom Corporation BCM43227 802.11b/g/n [14e4:4358] 
    Subsystem: Foxconn International, Inc. Device [105b:e040]

Answer 1

Try a

sudo modprobe -r acer_wmi
sudo rfkill unblock wifi
sudo rfkill unblock all

And be sure that you have your Laptop's wifi-switch on.