Recently, I upgraded to 18.04 from 16.04 on Lenovo Thinkpad P50. When I come home, and wake up laptop from sleep, it connects to wifi connection but internet connectivity is not established. I can ping to router but cannot ping to any website. I restarted network-manager service but it does not wor.


After upgrading, by default network manager was not managing eth0 and wlan0 interfaces defined in


To enable network manager to manage these interfaces, open

sudo gedit /etc/NetworkManager/NetworkManager.conf


[ifupdown] managed=false


[ifupdown] managed=true

It solved the problem.

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