Dns change is also very easy for ubuntu. Go to network tool on the panel tray,

–> right click –> edit connections

–> choose wired or wireless connection

–> come to IPv4 settings

–> choose authomatic (DHCP) addresses only

–> write this way 208.67.222.222, 208.67.220.220 (for opendns) you can use also google dns (8.8.8.8, 8.8.4.4)

–> apply

That is all ! No need for restarting.

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