I have just installed the Ubuntu 11.10 and facing challenges connecting to Internet using Ethernet connection. Below is the configuration details: IP address: 172.19.40.16 Subnet mask: 255.255.255.0 Default gateway: 172.19.40.1 When I run the command ifconfig I don't find the IP address in inet addr: Even when I try to change the Network device to "Ethernet" in Network tools, the changes are not getting saved. Please help. Let me know if you want further information.