Public bug reported:

Binary package hint: file-roller

Steps to recreate:
Right click a file to bring up the compression dialog.
Select the 7z format.
Under other options: enter a password, and check "Encrypt the file list too"
Click create.

Compress another file in the zip format, and enter a password.
"Encrypt the file list too" will be checked, but greyed out.
Clicking create will generate the following error.
---------------------------
7-Zip 9.04 beta  Copyright (c) 1999-2009 Igor Pavlov  2009-05-30
p7zip Version 9.04 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,2 CPUs)
Scanning

Creating archive /home/greg/Desktop/f143963072.jpg.zip


System error:
E_INVALIDARG                
---------------------------
This is the same error received when using 7z with -tzip -mhe=on
mhe=on can only be used with the 7z format.

A quick way to uncheck it is to use:
gconftool-2 --type bool --set /apps/file-roller/general/encrypt_header false


$lsb_release -rd
Description:    Ubuntu 9.10
Release:        9.10

$apt-cache policy file-roller
file-roller:
  Installed: 2.28.1-0ubuntu1
  Candidate: 2.28.1-0ubuntu1
  Version table:
 *** 2.28.1-0ubuntu1 0
        500 http://us.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status

** Affects: file-roller (Ubuntu)
     Importance: Undecided
         Status: New

-- 
encrypt_header is left enabled when creating zip archives
https://bugs.launchpad.net/bugs/464324
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