BCM43142: No network devices detected

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.

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).

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