STEPS TO REPRODUCE
1. Install kdenetwork-filesharing
2. In dolphin right click a folder you wish to share, and click properties.
2. Select the 'Share' tab in the properties window.
3. Click the button to install the distro samba package.
OBSERVED RESULT
An expected polkit dialog to authorise packagekit to install the
distro samba package does not appear.
The message "The samba package failed to install" is displayed instead.
EXPECTED RESULT
A polkit auth diagog should appear, and upon successful admin password
entry the distro samba package should be installed and the sharing
options enabled.
Ref: https://bugs.kde.org/show_bug.cgi?id=472145