Ubuntu: Can't change ethernet card's IP address


I have Ubuntu 12.10 desktop version installed on HP 4000 PC, when I try to set up static IP address for NIC by using Network from menu bar, and switch from DHCP to manual, I can add static IP, default gateway and network mask. However the Save button has been grayed out. So I can't set up static IP address for the NIC. Can anybody give me some explanations?

Thanks for your help.


Try following this guide to change the IP manually, that will usually do the trick:


Regards, Stefan.

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