Leny@farhan In Ubuntu 18.04 it's in Settings (e.g. Click Top right corner, Click on WiFi name opening triangle, click on Wifi settings) then click on the gear for your WiFi , go to the IPv4 tab, click on the radio button which says Manual and fill the details in. In XFCE (Xubuntu) DE something similar is under Applications > Settings > Advanced Network Settings.
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