Ubuntu: No longer able to use WiFi, adapter Intel WiFi Link 5100, Ubuntu 12.04


Computer: Acer Aspire 7730. Only Ubuntu installed.

Hi, I installed Ubuntu 12.04 yesterday and WiFi worked out of the box. But now the WiFi does not work anymore. It was after I did a

sudo apt-get update  

in order to try to fix Spotify (native) (couldn't start it), but I've since learned that update does not actually update any packages (correct me if I'm wrong). But if was after the reboot (Ubuntu wanted me to reboot) that my WiFi no longer works.

If I type

sudo lshw -c network  

This is the output:

   *-network UNCLAIMED              description: Network controller         product: WiFi Link 5100         vendor: Intel Corporation         physical id: 0         bus info: pci@0000:07:00.0         version: 00         width: 64 bits         clock: 33MHz         capabilities: pm msi pciexpress cap_list         configuration: latency=0         resources: memory:c0a00000-c0a01fff  

So my WiFi adapter is unclaimed, which I've read means that no driver is associated with it.




lo        no wireless extensions.  eth0      no wireless extensions.  

This is the link that I wanted to use to try to install iwlwifi (I first wanted to try a Linux driver instead of the whole Windows wireless Driver thing. Plus when I tried to find the driver for this adapter, I could only find .exe files, while it said that I should find .inf files).

Running this

cd /lib/firmware  ls *.ucode  


iwlwifi-1000-5.ucode  iwlwifi-2030-6.ucode  iwlwifi-6000-4.ucode  iwlwifi-100-5.ucode   iwlwifi-3945-2.ucode  iwlwifi-6000g2a-5.ucode  iwlwifi-105-6.ucode   iwlwifi-4965-2.ucode  iwlwifi-6000g2a-6.ucode  iwlwifi-135-6.ucode   iwlwifi-5000-5.ucode  iwlwifi-6000g2b-6.ucode  iwlwifi-2000-6.ucode  iwlwifi-5150-2.ucode  iwlwifi-6050-5.ucode  

Notice the iwlwifi-5000-5.ucode. This looks very similar to the file(s) that I downloaded from the previous website that I showed. So since it is already there, I haven't tried to install it to that directory yet (and I'm not quite certain how to do it). Maybe the kernel/system/whatever simply doesn't load the driver on boot-up?

Most of the problems I've had with Ubuntu so far have been solved with copy pasting terminal commands without knowing what they do, but it feels like the more I do this the more brittle the whole system becomes (because I don't know what I'm doing). It seems that installing and updating software can lead to unforeseen, bad side-effects that I don't have the skill to foresee. So for this problem I want to ask someone directly before I proceed.



The driver for your card, iwlwifi, is already present in the 12.04 kernel, as is the required firmware. Let's load it and see if your wireless springs to life:

sudo modprobe iwlwifi  iwconfig  

Did a wireless interface wlan0 get created? If not, check the message logs to troubleshoot:

dmesg | grep iwl  rfkill list all  

The pipe symbol | is on the right side of my US keyboard on the same key with backslash.


Your problem looks similar to mine, and I think the new kernel and broadcom drivers are the problem. I ran this, restarted, and it fixed it:

sudo apt-get install linux-headers-generic  sudo apt-get install --reinstall bcmwl-kernel-source  sudo modprobe wl  

If that does not work then you can look at these two links for some other ideas:

If you use the #6 solution please also run the commands found at this link:http://ubuntuforums.org/showthread.php?t=1966012#9

Hope this helps!

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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