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Somthing happened with the latest update for 18.04. I have a desktop machine on the network with the same dns servers that work fine, but my laptop on the same network, same dns entries give error server IP address could not be found. DNS_PROBE_FINISHED_NXDOMAIN Also, I can switch to using my phone wifi hotspot, the phone reaches all sites, but laptop does not. I suspect a driver issue, but I am 10 hours into trial and error and would really appreciate any help.

I have tried the r8168-dkms driver. I have played with resolved.conf, NetworkManager.conf and I keep hitting dead ends.

> lspci

3a:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12)

3b:00.0 Network controller: Intel Corporation Device 24fb (rev 10)

> nmcli device show wlp59s0 | grep IP4.DNS

IP4.DNS[1]:                             209.18.47.61

IP4.DNS[2]:                             209.18.47.63

EDIT:

> ls -al /etc/resolv.conf

lrwxrwxrwx 1 root root 29 Jan 13  2018 /etc/resolv.conf -> ../run/resolvconf/resolv.conf



> ping -c3 8.8.8.8

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

64 bytes from 8.8.8.8: icmp_seq=1 ttl=54 time=27.9 ms

64 bytes from 8.8.8.8: icmp_seq=2 ttl=54 time=26.1 ms

64 bytes from 8.8.8.8: icmp_seq=3 ttl=54 time=24.3 ms



--- 8.8.8.8 ping statistics ---

3 packets transmitted, 3 received, 0% packet loss, time 2003ms

rtt min/avg/max/mdev = 24.373/26.153/27.929/1.451 ms

EDIT 2, updated link ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf

> ping -c3 8.8.8.8

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

64 bytes from 8.8.8.8: icmp_seq=1 ttl=54 time=33.4 ms

64 bytes from 8.8.8.8: icmp_seq=2 ttl=54 time=85.3 ms

64 bytes from 8.8.8.8: icmp_seq=3 ttl=54 time=22.5 ms



--- 8.8.8.8 ping statistics ---

3 packets transmitted, 3 received, 0% packet loss, time 2004ms

rtt min/avg/max/mdev = 22.536/47.117/85.325/27.384 ms



> ping -c3 www.ubuntu.com

PING www.ubuntu.com (91.189.89.110) 56(84) bytes of data.

64 bytes from www-ubuntu-com.nuno.canonical.com (91.189.89.110): icmp_seq=1 ttl=51 time=139 ms

64 bytes from www-ubuntu-com.nuno.canonical.com (91.189.89.110): icmp_seq=2 ttl=51 time=164 ms

64 bytes from www-ubuntu-com.nuno.canonical.com (91.189.89.110): icmp_seq=3 ttl=51 time=191 ms



--- www.ubuntu.com ping statistics ---

3 packets transmitted, 3 received, 0% packet loss, time 2004ms

rtt min/avg/max/mdev = 139.502/165.177/191.481/21.224 ms

note: I resolved this issue, but I had the same dns issue when I booted to the .13 kernel

When you ran:

 ls -al /etc/resolv.conf

Your result was:

wxrwxrwx 1 root root 29 Jan 13  2018 /etc/resolv.conf -> ../run/resolvconf/resolv.conf

In your case, resolv.conf is not pointing to systemd as expected. Therefore, I suggest that you remove and recreate the link:

sudo rm -f /etc/resolv.conf

ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf

Reboot and show us:

ping -c3 8.8.8.8

ping -c3 www.ubuntu.com

NOTE: From my machine, your DNS nameservers, 209.18.47.61 and 209.18.47.63 are not pingable and I wonder if the numbers are valid.