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Netgear WNA3100 on Ubuntu 10.10
Here is how to install the drivers for WNA3100 under Ubuntu.

1. Get ndiswrapper source code here:

2. Untar the archive.
3. Append the following to driver/ntoskernel_io.c

wstdcall NTSTATUS WIN_FUNC(IoUnregisterPlugPlayNotification,1)
(void *tag)
TRACE2("%p", tag);
TODO(); /* Probably Not, legacy function abandoned in Windows 7 */
IOEXIT(return STATUS_SUCCESS); /* Linux doesn't use it either */

NOTE: be sure to remove the trailing spaces, otherwise mkexports.sh will not recognize new function and you will get errors during make process. 

4. Get a patch from here:
Put it in the driver folder, then run
patch -p1 < ndis*.patch

5. Uninstall all ndiswrapper packages, if installed (sudo apt-get remove ndiswrapper- to see installed packages and then hit ENTER to remove).

6. You may need to do (if the following step fails)
sudo apt-get build-dep ndiswrapper-dkms

7. Compile:

8. Install:
sudo make install

9. In my case, it installed to a wrong folder (/lib/modules/misc). If this is the case, in sudo mode, copy the file ndiswrapped.ko from that dir to

then do
sudo /sbin/depmod -a -b /

10. Check the installation:
ndiswrapper -i

should print something like this:
utils version: '1.9', utils version needed by module: '1.9'
module details:
filename: /lib/modules/2.6.35-24-generic-pae/kernel/drivers/misc/ndiswrapper.ko
version: 1.56
vermagic: 2.6.35-24-generic-pae SMP mod_unload modversions 686

11. Then you need to get Windows driver files: bcmwlhigh5.inf, bcmwlhigh5.sys. Either run the installation CD on a Windows machine, or do an installation under Wine.
In my case, it put the files in ~/.wine/drive_c/Program Files/NETGEAR/WNA3100/Driver/WinXP2000

12. Install the Windows driver:
sudo ndiswrapper -i bcmwlhigh5.inf

13. Check the installation (don't forget to plug in the device as I did :) ):
ndiswrapper -l
should print
bcmwlhigh5 : driver installed
device (0846:9020) present

14. Enjoy (use network manager to connect to your wireless network).