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Wireless doesn't work on a Broadcom BCM4311
Broadcom BCM4311 Wireless not working

I recently installed 11.04 (and its crap compared to 10.x, but its free so meh..), anyway, I am still a bit of a noob, and cannot get the wireless to work.

I am using a Dell Inspiron 6400. I have attempted to follow the instructions here: http://ubuntuforums.org/showthread.php?t=779754&highlight=wireless+work+hardy and here http://ubuntuforums.org/showthread.php?t=769990.

But when I type in sudo ifconfig wlan0 up, it says wlan0: ERROR while getting interface flags: No such device .

Normally my wifi light would come on if I press Fn + F2, but even that does not happen now.

lspci produces the following:

00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)
00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 01)
00:1c.3 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 4 (rev 01)
00:1d.0 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01)
00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01)
00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e1)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 01)
00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 01)
00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 01)
03:00.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
03:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller
03:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19)
03:01.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 0a)
03:01.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 05)
0b:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)

So I guess the important bit is BCM4311.

Any help would be greatfull.

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marked as duplicate by Jorge Castro, Oli Oct 20 '11 at 22:51

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1  
please have a look here , i hope it helps help.ubuntu.com/community/WifiDocs/Driver/bcm43xx it seems that you need the STA driver. check your driver by typing in the dash additional drivers, open it and see if it gives you any suggestions –  suli8 Jun 25 '11 at 0:43
    
Could you add the output of rfkill list wifi, put the contents of the /var/log/kern.log file on paste.ubuntu.com and add the link here? –  Lekensteyn Jun 25 '11 at 9:36
    
@suli8 I've checked under Additional drivers it says Broadcom propreitary wireless driver is installed and working. –  john mossel Jun 25 '11 at 17:22
    
@Lekensteyn: paste.ubuntu.com/632502 –  john mossel Jun 25 '11 at 17:24
    
@john mossel: please check if askubuntu.com/q/38279/6969 is a duplicate of your question. If not, could you clarify "wifi does not work"? E.g. "I can see wireless networks, but not connect to them". Could you add the output of lshw -c network to your question? You still need to add you /var/log/kern.log file –  Lekensteyn Jun 25 '11 at 17:31

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