No WIFI on Ubuntu 12.04 LTS after today software update

Question

I just got new dell inspiron3537 with Ubuntu 12.04 LTS (no windows O/S). It got some wireless (hard block) yesterday. So, this morning, I ran the software update all the security update.

After that I can't see "Wireless" in system setting. So, I updated all the software update and looked thru several web site and found sudo lshw -c network command. I tried and found the result below.

  *-network
       description: Ethernet interface
       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: 07
       serial: 74:86:7a:40:5d:48
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full ip=192.168.1.10 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       resources: irq:60 ioport:4000(size=256) memory:c0700000-c0700fff memory:c0400000-c0403fff

  *-network UNCLAIMED
       description: Network controller
       product: QCA9565 / AR9565 Wireless Network Adapter
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 01
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:c0600000-c067ffff memory:9fb00000-9fb0ffff

Please suggest what I should do to fix it.

Answer 1

I had the same problem. The solution is here http://ubuntuforums.org/showthread.php?t=2103062 (Compaq has the same adapter). I followed the instructions and now wi-fi works properly.

...we install the prerequitites needed to compile:

sudo apt-get install linux-headers-generic build-essential

Now we download the package, extract it and install it:

wget http://www.orbit-lab.org/kernel/compat-wireless-3-stable/v3.6/compat-wireless-3.6.6-1-snpc.tar.bz2 tar xvf compat* cd compat-wireless-3.6.6-1-snpc sudo su ./scripts/driver-select ath9k make make install modprobe ath9k exit