I just upgraded an RPi configured as a wireless router to from 15.10 to 16.04. dnsmasq is failing during startup with an unknown interface br0. Before the upgrade, the log showed a wait for auto interfaces to complete, which is missing in the new boot log. When startup is complete, I can log in and manually start dnsmasq, which runs without problem.

br0 is the only interface declared as auto in /etc/network/interfaces.

I found the solution myself. Add the follow two lines in the [Unit] section of /lib/systemd/system/dnsmasq.service


See https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1531184 for more detail.

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.