I am using ubuntu 8.04
If you have broadband then you plug one end of your ethernet cable in RJ45 connector at back of CPU & another into port on the wall.
Let us say your networking is disabled then
On your desktop right click on nm-applet(computer connection icon on top right panel) & select enable networking.There will be circular animation in that icon.Let it end.
Now right click on nm-applet & select connection information.
if IP address,broadcast address,subnet mast etc. is not 0.0.0.0 then your internet will work.
left click on nm-applet & select wired network.
Now it should work.
if all this does not work then left-click on nm-applet & select manual configuration within which you have to provide dns server,IP address,subnet mask,gateway address etc..
Note down all these things from your working windows.
(1)In windows go to control panel>network connections & double-click the LAN to find ip address,subnet mask,default gateway in support tab of status window.
(2)In command prompt of windows run command 'ipconfig' (without quotes).
Hope , it helps.
Last edited by sumeet inani; 05-19-2010 at 01:14 AM.
Reason: Full step-by-step detail.