Same problem here (Kubuntu Intrepid), though I found a different solution: I commented out the "iface XXX inet dhcp"-lines and now NM works like a charm again.
Here's my /etc/network/interfaces, just to make it clear, what I mean:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
#iface eth0 inet dhcp
# The wireless network interface
auto wlan0
#iface wlan0 inet dhcp
Same problem here (Kubuntu Intrepid), though I found a different solution: I commented out the "iface XXX inet dhcp"-lines and now NM works like a charm again.
Here's my /etc/network/ interfaces, just to make it clear, what I mean:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
#iface eth0 inet dhcp
# The wireless network interface
auto wlan0
#iface wlan0 inet dhcp