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I would like to make a Virtual Router on Ubuntu 12.04

but i am getting this error message when i run the last terminal command

Configuration file: hostapd.conf
nl80211: Could not configure driver mode
nl80211 driver initialization failed.
hostapd_free_hapd_data: Interface wlan0 wasn't started
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Are you using 14.04? There is an open bug for hostapd with these error message. Launchpad bug #1289047 hostapd package is broken – bain May 28 '14 at 13:49

4 Answers 4

As @bain has rightly pointed out, there is a bug raised in launchpad for this very purpose. This workaround suggested there works perfectly for me:

sudo nmcli nm wifi off
sudo rfkill unblock wlan

sudo ifconfig wlan0 up
sleep 1
sudo service isc-dhcp-server restart
sudo service hostapd restart

The first two lines stop wlan from network manager, and then unblocks the interface, so ifconfig can work.

The next commands uses ifconfig to bring up wlan and allows a second's delay, then restart the dhcp server (though I did not need this restart in my setup), and finally start the hostapd service.

It should now start w/o any issues.

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Newer nmcli requires this syntax sudo nmcli radio wifi off :) – M132 May 14 at 20:01

I just had this error on Raspberry pi running Kali linux and hostapd 2.4 I suspected it is because some other network processes are keeping the interface busy, so I ran this airmon-ng command that checks and kills and processes that might use the wifi card:

airmon-ng check kill

To just see any network processes without killing them, use airmon-ng check. After I killed them, I started hostapd again and no errors came up anymore.

For some other network functionality you might need those processes, I restarted the raspberry for that, but they can also be started individually.

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Just mention that according to the bug linked by @bain, the easiest solution is to disable Network Manager for the interface that is to be run with hostapd.

As mentioned there:

WORKAROUND: For this to persist through reboots, execute the following in a terminal:
sudo nano /etc/NetworkManager/NetworkManager.conf

Add the following entry where the x's are replaced with your WiFi MAC address, save, and then reboot:
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Try this:

  1. Click the network icon
  2. Select "Create wireless network"
  3. Choose a name, encryption type and password
  4. Click create
  5. Make sure you're connected to the internet.
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