wifi scanning results say No scan results

Question

I'm trying to use wifi access in Ubuntu 12.04 and for some reason, I do not want to use network-manager. So, I removed it.

What I'm trying to do is to see what kind of APs around me, so I issued the following command and results in:

$ sudo iwlist wlan0 scan
wlan0 No scan results

I'm pretty sure that I have lot of APs around me, and I'm not sure that my device is not working correctly, or am I missing something.

lspci shows the correct device

$ lspci | grep Broad
02:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)

I up the wlan0 with the following command

$ ifconfig wlan0 up

Could you tell me what I'm doing wrong here?

Solution

I had this same problem. It was an internal card and the system detected it. The drivers were loaded, but it found no wireless networks.

It was an antenna issue. I connected the antenna leads and it worked.

Comments

[yPhil]

Does wlan0 have a local IP?

[BЈовић]

maybe problem with wifi (see this)

[jaeyong]

@xaccrocheur No, it doesn't.

[Pilot6]

possible duplicate of Installing Broadcom Wireless Drivers