Purging ufw causes system lockup with NFS-root

Binary package hint: ufw

System where problem was experienced:

Package Version: ufw 0.16.2.4
Description: Ubuntu 8.04.4 LTS
Release: 8.04

Problem still exists in current karmic. Verified with

Package Version ufw: 0.29-4ubuntu1
Description: Ubuntu 9.10
Release: 9.10

Problem Description:

When purging ufw, a system using NFS for its root file-system and having a firewall configuration with policy DROP hangs irrevocably. The reason for this is the order the ufw.postrm script clears the firewall:

Step 1 - iptables -F

This removes all rules allowing network traffic to the NFS server, _the server hangs_ trying to execute the next step because it can't read the executable from the filesystem.

Step 2 - iptables -X
Step 3 - iptables -P INPUT ACCEPT
Step 4 - iptables -P OUTPUT ACCEPT
Step 5 - iptables -P FORWARD ACCEPT

Solution Suggestion:

Putting steps 3-5 _before_ steps 1-2 would completely solve this problem.