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... and other computers on LAN have connection to internet.

Connecting via a WiFi extender to ISP provided router.

I can ssh to a computer that is hard wired to the router and show that that has a working internet connection (via the router).

Restarting network-manager does not help.

Restarting Ubuntu (without restarting the router or extender) always solves the problem.

Using Ubuntu 16.04. A way to restart whatever is stopping without having to restart the whole PC would help.

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  • probably dhcpd ?
    – damadam
    Commented Jun 7, 2018 at 12:21
  • Thanks @damadam but I don't think I'm using dhcpd(?). It's not a running process and isn't a recognised service ... Commented Jun 7, 2018 at 12:30
  • made a mistake typo, udhcpd is the name
    – damadam
    Commented Jun 7, 2018 at 12:42
  • The only process with dhc in the name is /sbin/dhclient and I've just checked and that is restarted when I restart network-manager. Commented Jun 7, 2018 at 12:51
  • When u ssh into your lan-pc's do you use ip adresses? ever tried to ping google.com and ping 172.217.18.14 ? If both is not working, i dont know. If IP is working than it might be a DNS issue. Compare the output of route before you reboot while internet is not working, with the output of route after you did reboot while the internet is working. Any differences? The same you could do with the outputs of cat /etc/resolver.conf Commented Jun 7, 2018 at 20:03

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