Could anyone help me get my NETGEAR WNA3100 (Broadcom BCM43231) wireless adapter to work?

I had exactly the same problem with my WNA3100 and Ubuntu 11.04 After two weeks of trying all suggestions I could find on the net, I succeeded. I hardly know anything about Linux and found it quite simple. You just need the right driver.

Do the following step by step:

• plug in the wna3100

• open the terminal and type: lsusb

• hit enter, you should see something like this:

  Bus 001 Device 002: ID 0846:9020 NetGear, Inc.
  

• if the answer is yes go on with the following

• create a folder somewhere you could find it easily (name it wifi driver or so)

• download the driver from here: (just copy the url, paste it in your web browser and hit enter if the link doesn't work)

  http://media.cdn.ubuntu-de.org/forum/attachments/2612284/Broadcom_bcm43xx_USB_32_64bit_v2.tar.gz

• You will get a box that ask to open or save the driver file

• open it with whatever program you use to unzip (or save it somewhere and unzip it from there)

• unzip it to the folder you created in the first step

• right click both .inf files, go to tab 'rights' and click on the make file executable box (mine is in dutch so I don't know if the translation is right)

• close that window

• do the same for the .sys files

• now open the windows wireless driver program (download it from ubuntu software center if you don't have it)
• browse the .inf file with that program and click install.
• never erase the folder where the .inf and .sys files are found
• pull out the wna3100
• reboot your computer
• plug in the wna3100, when it stops blinking open the network manager.
• You should be able to see your wireless network.
• if yes, then jump up like me and shout yeehaah (or something alike)
• if not, i feel really sorry for you, but somehow this worked for me and my ubuntu 11.04.

Actually an open source driver has been developed for the Netgear A6210 that also works for the Netgear WNDA3100v3. While I'm not sure which version you have, I know from experience that this driver also works for the v3:

https://github.com/jurobystricky/Netgear-A6210?