Comment 8 for bug 398945

$ sudo dpkg -i gufw_9.10.1-0ubuntu1_all.deb
[sudo] password for bugabundo:
(Reading database ... 213120 files and directories currently installed.)
Preparing to replace gufw 9.10.0~bzr23-0ubuntu1 (using gufw_9.10.1-0ubuntu1_all.deb) ...
Unpacking replacement gufw ...
Setting up gufw (9.10.1-0ubuntu1) ...
Installing new version of config file /etc/gufw/gufw.cfg ...

Configuration file `/etc/gufw/size_window.cfg'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ? Your options are:
    Y or I : install the package maintainer's version
    N or O : keep your currently-installed version
      D : show the differences between the versions
      Z : background this process to examine the situation
 The default action is to keep your current version.
*** size_window.cfg (Y/I/N/O/D/Z) [default=N] ? y
Installing new version of config file /etc/gufw/size_window.cfg ...

Processing triggers for desktop-file-utils ...
Processing triggers for hicolor-icon-theme ...
Processing triggers for man-db ...
Processing triggers for menu ...

$ apt-cache policy gufw
gufw:
  Installed: 9.10.1-0ubuntu1
  Candidate: 9.10.1-0ubuntu1
  Version table:
 *** 9.10.1-0ubuntu1 0
        100 /var/lib/dpkg/status
     9.10.0~bzr23-0ubuntu1 0
        500 http://darkstar.ist.utl.pt karmic/universe Packages
        500 http://archive.ubuntu.com karmic/universe Packages

$ gufw

Works for me.