Comment 4 for bug 354559

Just did a fresh install of Kubuntu Jaunty Beta.

1 - Logged in
2 - Started Dolphin
3 - Right clicked Pictures folder and selected Properties
4 - Selected Share Tab
5 - Selected "Configure File Sharing" button
6 - Request for password appeared - Entered password and requester disappeared with nothing else happening.
7 - Selected "Configure File Sharing" button again - Nothing happens.
8 - Selected Cancel button and the requester disappeared.

Then I started KPackageKit from the K Menu and installed kdenetwork-filesharing package.

1 - Right clicked Pictures folder in Dolphin and selected Properties
2 - Selected Share Tab
3 - Selected "Configure File Sharing" button.
No request for a password was made cause it had been typed in previously.
4 - "Enable or Disable file sharing" Requester popped up with a note mentioning that SMB and NFS are not installed on this machine, to enable this module the servers must be installed.

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This is the system behavior I've experienced on multiple Jaunty installs on multiple machines so I don't understand why it's not working for you.