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in the past month or so I've started experiencing extremely frustrating DNS issues, whereby I often see a 'connecting message in the browser for 10 -30 seconds before a site loads, and also often have connection timeouts.

After much googling I tried this suggestions Remove (or comment out) the below line from /etc/NetworkManager/NetworkManager.conf: dns=dnsmasq

It is definitely something related to my Ubuntu install because another PC running windows on the same network has zero issues. but it has made no difference. Can anyone offer me either a solution or some good troubleshooting steps?

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I'm on 14.04 LTS but had the same issue and it turned out that my dns-searches was somehow looking at the wrong place (locally).

In the NetworkManager (nm-connection-editor) my DNS server was set to 192.168.100.1. But when checking /etc/resolv.conf is tells me 127.0.1.1. So if I try to lookup something:

$ nslookup www.google.com
Server:        127.0.1.1
...

After removing the dns=dnsmas-row from /etc/NetworkManager/NetworkManager.conf and rebooting it works flawlessly. /etc/resolv.conf tells me 192.168.100.1 and first line of nslookup:

$ nslookup www.google.com
Server:        192.168.100.1
...
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