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I have a Dell XPS-15 on Ubuntu 12.10 with a wifi card Intel Centrino Advanced-N 6235. I don't know why but I don't have access to wifi anymore, my card is detected but I can't activate it.

Here is the output I get for some commands:

sudo lshw -C network
   description: Ethernet interface
   product: RTL8111/8168B PCI Express Gigabit Ethernet controller
   vendor: Realtek Semiconductor Co., Ltd.
   physical id: 0
   bus info: pci@0000:07:00.0
   logical name: eth0
   version: 07
   serial: d4:be:d9:6c:c7:27
   size: 100Mbit/s
   capacity: 1Gbit/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 1000bt 1000bt-fd autonegotiation
   configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168e-3_0.0.4 03/27/12 ip= latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
   resources: irq:46 ioport:2000(size=256) memory:d2404000-d2404fff memory:d2400000-d2403fff
*-network UNCLAIMED
   description: Network controller
   product: Centrino Advanced-N 6235
   vendor: Intel Corporation
   physical id: 0
   bus info: pci@0000:08:00.0
   version: 24
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress cap_list
   configuration: latency=0
   resources: memory:d2600000-d2601fff

And from iwconfig

eth0      no wireless extensions.

lo        no wireless extensions.

I don't know why wlan0 is not shown anymore.

When I try to activate it I get the following error message:

ifconfig wlan0 up
wlan0: ERROR while getting interface flags: No such device

Can someone tell me how I can activate my wifi card? Thanks in advance.

share|improve this question

I've got the same problem on another laptop and you can try this: sudo rfkill list

you'll know if your wifi card is not restricted

then you could try install compat-wireless-3.6.6-1-snpc

sorry for my english.:)

share|improve this answer
Thanks for the rapid answer. I get the following code: 'sudo rfkill list 1: hci0: Bluetooth Soft blocked: no Hard blocked: no' But I don't know where you found your compat-wireless-3.6.6-1-snpc package – Naruthideo Mar 11 '13 at 17:32
sudo apt-get install linux-headers-generic build-essential wget… tar xvf compat* cd compat-wireless-3.6.6-1-snpc sudo su ./scripts/driver-select ath9k make make install modprobe ath9k exit it's complete process give me a reasult.. – Jakub_Cermak Mar 11 '13 at 19:50
Hello, I followed your instructions and when I run modprobe ath9k and got WARNING: Error inserting ath9k_hw (/lib/modules/3.5.0-25-generic/updates/drivers/net/wireless/ath/ath9k/ath9k_hw.k‌​o): Invalid argument WARNING: Error inserting ath9k_common (/lib/modules/3.5.0-25-generic/updates/drivers/net/wireless/ath/ath9k/ath9k_comm‌​on.ko): Invalid argument WARNING: Error inserting mac80211 (/lib/modules/3.5.0-25-generic/updates/net/mac80211/mac80211.ko): Invalid argument FATAL: Error inserting ath9k (/lib/modules/3.5.0-25-generic/updates/drivers/net/wireless/ath/ath9k/ath9k.ko): Invalid argument – Naruthideo Mar 12 '13 at 9:05

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