I noticed this issue on one of the two computers I upgraded from xenial to yakkety. Specifically the affected computer was an 2016 Dell XPS 13. They're both similarly configured ubuntu installations with Broadcom nics, so it's curious that this only affects one of them. I'm not sure what debug information would be helpful, but I'm happy to provide anything that would be useful.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1629620 Title: DNS resolver stops accepting queries Status in network-manager package in Ubuntu: Confirmed Bug description: After a while / after resume from suspend, the system becomes unable to respond to DNS queries, with the following output for example: $ nslookup google.com 127.0.1.1 Server: 127.0.1.1 Address: 127.0.1.1#53 ** server can't find google.com: REFUSED This is on an up to date yakkety install. Changing resolv.conf to use 126.96.36.199, or restarting network-manager appears to fix this, at least until it recurs again. ProblemType: Bug DistroRelease: Ubuntu 16.10 Package: network-manager 1.2.4-0ubuntu1 ProcVersionSignature: Ubuntu 4.8.0-17.19-generic 4.8.0-rc7 Uname: Linux 4.8.0-17-generic x86_64 ApportVersion: 2.20.3-0ubuntu7 Architecture: amd64 CurrentDesktop: GNOME Date: Sat Oct 1 21:28:51 2016 EcryptfsInUse: Yes IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2015-08-21 (407 days ago) InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150819) IpRoute: default via 192.168.1.1 dev wlp3s0 proto static metric 600 169.254.0.0/16 dev docker0 scope link metric 1000 linkdown 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 192.168.1.0/24 dev wlp3s0 proto kernel scope link src 192.168.1.5 metric 600 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true WimaxEnabled=true ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: network-manager UpgradeStatus: Upgraded to yakkety on 2016-09-29 (2 days ago) nmcli-dev: DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH docker0 bridge connected /org/freedesktop/NetworkManager/Devices/1 docker0 63f0b05b-f699-4a68-81ce-f62d2c1a247d /org/freedesktop/NetworkManager/ActiveConnection/0 wlp3s0 wifi connected /org/freedesktop/NetworkManager/Devices/4 HOME-1622-5 6df3f2f0-fb86-43b5-802a-d59bc5734be3 /org/freedesktop/NetworkManager/ActiveConnection/2 24:DA:9B:B9:09:0E bt disconnected /org/freedesktop/NetworkManager/Devices/3 -- -- -- lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/2 -- -- -- nmcli-nm: RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN running 1.2.4 connected started full enabled enabled enabled enabled enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1629620/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp