Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I'm running Ubuntu 12.04 on a Lenovo Ideapad Z580. For the last 3 days, the wireless network icon no longer displays (and I can't connect to) two networks that I was previously connecting to and that other users and my phone are stil able to connect to without difficiulty. However, it continues to display a dozen other networks in the building.

Exactly the same problem is described here: Ubuntu 12.10 - network manager not listing wireless networks but unfortunately the solutions listed there do not resolve the problem for me.

I've also tried the suggestion given here: Ubuntu 12.04 not connecting to some wifi network but to no avail.

The information given here also fails to resolve my problem: https://help.ubuntu.com/12.10/ubuntu-help/net-wireless-find.html

One other thing I tried was booting a previous kernel, but that didn't help.

Here's the relevant output from lspci and ifconfig

sudo lspci
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM76 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 635M] (rev a1)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 05)
04:00.0 Network controller: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter (rev 01)

sudo ifconfig
eth0      Link encap:Ethernet  HWaddr 08:9e:01:6a:7e:be  
          inet addr:192.168.1.16  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::a9e:1ff:fe6a:7ebe/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:11025 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3333 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2690159 (2.6 MB)  TX bytes:429359 (429.3 KB)
          Interrupt:43 Base address:0x8000 

eth1      Link encap:Ethernet  HWaddr 08:ed:b9:99:c0:97  
          inet6 addr: fe80::aed:b9ff:fe99:c097/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:28
          TX packets:0 errors:23 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:18 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:756 errors:0 dropped:0 overruns:0 frame:0
          TX packets:756 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:58543 (58.5 KB)  TX bytes:58543 (58.5 KB)

I would be most grateful for any suggestions.

share|improve this question
    
Check the answer in this question as it may be relevant to your Broadcom wifi card. –  douggro Feb 5 at 15:54
    
Thanks douggro, but that didn't work for me: I followed the instructions on that page, which left me with no driver at all, then reinstalled the bcmwl-kernel-source driver by following the instructions here: askubuntu.com/questions/265553/… which has left me back where I started - with some networks detected, but not the ones I want to use. –  Jeremy Amos Feb 10 at 14:56

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.