cannot set nautilus to browser mode

Ubuntu 11.04 Classic
Gnome 2.32.1
Nautilus 2.32.2

Further to question 149882 (which has been expired without a solution), I have exactly the same problem;
QUOTE
 "Open Nautilus
Go to Edit -> Preferences -> Behavior
Click the Help button
The Behavior Preferences page comes up
In that help page at the top it says: "You can set the following preferences:", listing one in particular called "Always open in browser windows"
Go back to your previously opened Behavior window from Edit->Preferences
The option "Always open in browser windows" IS NOT THERE."

I have reinstalled Nautilus with Synaptic but still no Browser Mode option available.
I don't know how to upload a screenshot so this is the best I can do to show the missing Browser mode option.
(Some of the symbols got messed during copy and paste)
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  Views│Behavior│Display│List Columns │Preview Media│Tweaks

    Behavior
          O Single click to open items
          Ä Double dick to open items
          □ Open each folder in its own window

    Executable Text Files
          O Run executable text files when they are opened
          O View executable text files when they are opened
          Ä Ask each time

    Trash
          þ Ask before emptying the Trash or deleting files
          □ Include a Delete command that bypasses Trash
  Help Close
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