Wireless not working

[manav_1001]

Hi everyone,

I logged into Ubuntu today and my wireless was not working. Usually when this happens I just restart and the wireless works, but this time instead of restarting I did sudo ifconfig eth0 down and then sudo ifconfig eth0 up.
Nothing happened after I did this, so I restarted....still nothing. So I restarted again and booted to Vista and even there the wireless was not working. I turned the wireless switch off and on but still there was a red x on the network icon next to the clock. I uninstalled my network driver and reinstalled it, but that didnt help too.
I booted into Ubuntu again and did ifconfig eth0 and this is the result I got:

eth0      Link encap:Ethernet  HWaddr 00:1b:38:f0:26:c2  
          inet6 addr: fe80::21b:38ff:fef0:26c2/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:97 errors:0 dropped:0 overruns:0 frame:0
          TX packets:64 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:55697 (55.6 KB)  TX bytes:7137 (7.1 KB)
          Interrupt:16 Base address:0x1000

Someone, Please help me bring back my wireless connectivity.

[nujinini]

Hi!

Just curious, were you able to also check the Fn + F5 combination?

[reed9]

As nujinini suggested, there is often a software switch for the card to turn if on and off. It may not be Fn+F5, but some other combination. Mine is Fn+F2.

There may also be a hardware switch you've accidentally flipped. It's fairly easy to accidently flip it on my laptop. Look for that.

eth0 is usually the wired ethernet card. Wireless cards are usually named wlan0, though some broadcom cards will be named eth1 or eth0, if you're using the broadcom wl driver, and some atheros cards using madwifi drivers are ath0. Check the output of iwconfig

Post the output of

lsmod
dmesg | grep wlan0

as well. Replace wlan0 with appropriate device name if different, as discovered with iwconfig.

[manav_1001]

I simply reinstalled ubuntu. It took me 15 mins and I have my wireless back.