can not save change in terminal

Binary package hint: gnome-terminal

Can not save change in terminal about ufw. I would like to drop echo request.
I replaced

# ok icmp codes
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT

with this:

# ok icmp codes
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j DROP
-A ufw-before-input -p icmp --icmp-type source-quench -j DROP
-A ufw-before-input -p icmp --icmp-type time-exceeded -j DROP
-A ufw-before-input -p icmp --icmp-type parameter-problem -j DROP
-A ufw-before-input -p icmp --icmp-type echo-request -j DROP

But I can not save the change.

ProblemType: Bug
Architecture: amd64
CheckboxSubmission: 8c25b16f0e1d1f7b2ef872bcc04fce5d
CheckboxSystem: da9af3b901b5569a389df6337f3d812f
Date: Sun Jan 10 23:57:54 2010
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gnome-terminal
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
NonfreeKernelModules: nvidia
Package: gnome-terminal 2.28.1-0ubuntu1
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-16.53-generic
SourcePackage: gnome-terminal
Uname: Linux 2.6.31-16-generic x86_64