I recently bought a Dell Inspiron 15 3521 with Windows 8 pre-installed, and installed Ubuntu 12.04 on it.
The wireless is not working on it. I have tried a lot of methods available at the forums, but none seem to work.
I first tried by installing the Broadcom STA wireless driver. When that didn't work, I followed some steps given on a forum to remove it and install b43 firmware instead. That didn't help either.
Here are the relevant terminal outputs
sudo lshw -C network *-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: 05 serial: 74:86:7a:20:2d:48 size: 10Mbit/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 firmware=rtl_nic/rtl8105e-1.fw ip=10.201.136.155 latency=0 link=yes multicast=yes port=MII speed=10Mbit/s resources: irq:42 ioport:2000(size=256) memory:c0404000-c0404fff 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:c0500000-c057ffff memory:afb00000-afb0ffff
and the output for
lspci -nn | grep 0280 02:00.0 Network controller : Atheros Communications Inc. Device [168c:0036] (rev 01)
I have tried doing
sudo modprobe ath9k
sudo modprobe b43