Comment 5 for bug 145382

root@gutsybeta:~# diff /etc/udev/rules.d/70-persistent-net.rules 70-persistent-net.rules
13c13
< SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:16:ec:6e:e1:fd", NAME="eth0"
---
> SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:16:ec:6e:e1:fd", NAME="eth1"

and

root@gutsybeta:~# diff /etc/network/interfaces interfaces
9,13c9,13
< auto eth0
< iface eth0 inet static
< address 192.168.20.14
< netmask 255.255.255.0
< gateway 192.168.20.1
---
> auto eth0
> iface eth0 inet dhcp

and a reboot seems to fix the problem of static assignment on a single network interface