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I installed Ubuntu 12.10 on my Dell Vostro 3460 and no network devices are detected (ethernet and wireless).

when I run lspci, I see:

1:00.0 Network controller: Broadcom Corporation BCM43142 821.11b/g/n (rev 01)
2:00.0 Ethernet controller: Atheros Communications Inc. AR8161 Gigabit Ethernet (rev 10)

rfkill list all lists only the Bluetooth device.

Ethernet works (with the help of How do I install drivers for the Atheros AR8161 Ethernet controller on 64-bit 12.10 using an Internet-connected 32-bit 12.04 PC and a USB flash drive?).

The wireless driver is installed (following Installing Broadcom Wireless Drivers), but it is not functioning.

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4 Answers 4

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+25

The simplest thing to do and which doesn't seem to have been suggested yet, is to open Additional Drivers (jockey-gtk), and check if you can install the proprietary drivers for your wireless card (if any). Then I would suggest a precautionary reboot.

If it still doesn't work, right-click NetworkManager and ensure that Enable Wireless is checked.

If it still doesn't work, then double-check wireless connectivity using wicd-gtk (sudo apt-get install wicd).

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These commands worked for me:

sudo apt-get update 
sudo apt-get install b43-fwcutter

I hope it gets you up and running. Have a great day, and good luck!

Here is a ref for the b43 official Ubuntu Community wiki: Ubuntu B43 Wiki

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Make sure your laptop does not have a hardware button for turning off your wireless. you can also check in BIOS if it is disabled.

Otherwise, I sometimes have problems with networking in Ubuntu, and then I simply use the Debian ways, e.g. edit /etc/networking/interfaces

and use tools such as

ifup eth0

or

ifconfig

to set up and test network equipment.

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Maybe you should try connecting using manual method:

sudo iwlist wlan0 scan

to scan for any AP

sudo iwconfig wlan0 essid "ssid"
sudo iwconfig wlan0 key "password"
sudo dhclient wlan0 

to configure the network / obtaining ip address

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