Missing network settings in KDE

Solution 1:

Installing full Kubuntu Desktop is the way of achieving full desktop installation with its complete features, but the package itself comes bundled with tons of default programs: kubuntu-desktop will install its own file manager, document reader, terminal emulator, etcm which is annoying to some people.

Aside from that, there is kde-plasma-desktop that offer plasma desktop with minimal installation. Unfortunately, the package doesn't include the kde's network manager while kubuntu-desktop does.

But the good news is, you can always install it manually.

sudo apt-get install plasma-nm

If the icon does not appear in your system tray, just logout and login.