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 *-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=188.8.131.52 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
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.