DNS servers are provided by dhclient via NetworkManager, and NetworkManager is responsible for starting dnsmasq and giving it the DNS information. The fact that 127.0.0.1 is the only thing in /etc/resolv.conf is indicative that dnsmasq should be taking over DNS resolution.
Can you please attach /run/nm-dns-dnsmasq.conf to this bug report, and verify that dnsmasq is indeed running when you notice this issue? ** Changed in: network-manager (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/964288 Title: Network manager not always finding DNS servers To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/964288/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs