Let us see whether you can reach a machine (here: the GNU Web server) on the Internet with its IP address and, if that works, with its name. In a terminal (that you find in the Accessories menu) enter the following two commands:
$ ping 140.186.70.148
$ ping gnu.org
To stop them, press Ctrl+C. If the machine is actually reach the 'ping' command writes, every second, one line that looks like the following:
64 bytes from 140.186.70.148: icmp_req=1 ttl=48 time=147 ms

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