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I recently upgraded from 11.10 to 12.04, and now NetworkManager isn't populating /etc/resolv.conf when connecting to wireless networks, when it had been working perfectly in 11.10. I'm not seeing any explicit errors in either the NM UI or in syslog. How do I diagnose what's wrong?

Edit: If I try to run resolvconf, I get the error "resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything." What should it be a symlink to and/or how do I get NM to populate it? This says the symlink should point to /run/resolvconf/resolv.conf, but that file does not exist on my system.

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3 Answers

up vote 22 down vote accepted

Use following command and answer YES to enable dynamic updates:

sudo dpkg-reconfigure resolvconf

Worked for me on Ubuntu 12.04.

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Worked perfectly. Have an old laptop with 12.04 a dead battery that I unplugged by accident. Could ping my home router but not get web pages. Oddly could access other wifi network. This gave me access through home network again. – Mark D Sep 18 '12 at 4:06
The question remains: Why was the symlink missing? This question is being addressed in bug #1000244 (bugs.launchpad.net/ubuntu/+source/resolvconf/+bug/1000244). See comment #66 for my best guesses about the various causes of this problem. – jdthood Oct 28 '12 at 20:47
up vote 4 down vote

If /etc/resolv.conf is a file then move it to /run/resolvconf/resolv.conf :

sudo mv /etc/resolv.conf /run/resolvconf/resolv.conf

Then create the symlink:

sudo ln -s ../run/resolvconf/resolv.conf /etc/resolv.conf
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This helps. But easier and more reliable (typos) way for doing that is sudo dpkg-reconfigure resolvconf and answer YES. – geekQ Mar 28 at 9:17
up vote 3 down vote

I had the same problem. Seems that Ubuntu is using a local resolver now. The fastest way to remove that is to comment out the following line in /etc/NetworkManager/NetworkManager.conf:

#dns=dnsmasq

For more information, please take a look at this page.

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Disabling that line and then restarting NM has no noticeable effect for me. The error still occurs and NM still refuses to populate resolv.conf. – Cerin May 15 '12 at 22:38

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