Comment 1 for bug 125448

/etc/network/interfaces
auto lo
iface lo inet loopback

# auto eth0
# iface eth0 inet dhcp

# auto eth1
# iface eth1 inet dhcp

# auto eth2
# iface eth2 inet dhcp

# auto ath0
# iface ath0 inet dhcp

# auto wlan0
# iface wlan0 inet dhcp

when your not using wireless, this could solve your problem.