Can you attach /etc/network/interfaces and /etc/resolv.conf? Possiblly before and after you do the change in Network Settings?
** Changed in: kdeadmin knetworkconf (Ubuntu)
Status: Unconfirmed => Needs Info
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Editing network configuration in KDE system settings with static IP causes
connectivity to external web addresses to be lost
https://launchpad.net/bugs/35092
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