Ubuntu 11.10 / 12.04: Starting too long because of "Waiting for network configuration"

If someone still experience delay in system booting with message:
- "Waiting for network configuration ..."
- "Waiting up to 60 more seconds for network configuration ..."
- "Booting system without full network configuration ..."

You can try to comment out the line "auto wlan0" in /etc/network/interfaces.