In my case this happened when hostapd failed for other reasons and left the mon.wlan0 interface there: the next time it failed to create it because it already existed, and I got that error message. This can be solved as follows:
ifconfig mon.wlan0 down -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/777383 Title: hostapd cannot create mon.wlan0 interface for wireless access point To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/hostapd/+bug/777383/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
