Please attach your upgrade logs from /var/log/dist-upgrade to help us try to see what has happened on your system.
Both before and after the upgrade, /etc/resolv.conf should be a symlink to /run/resolvconf/resolv.conf. If something has replaced that with a file, we would need to figure out what that is. It probably wasn't resolvconf itself. ** Changed in: resolvconf (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to resolvconf in Ubuntu. https://bugs.launchpad.net/bugs/1725840 Title: resolvconf not correctly configured after update from 17.04 to 17.10 Status in resolvconf package in Ubuntu: Incomplete Bug description: After having updated my laptop from Ubuntu 17.04 to 17.10, the DNS lookup on my wireless network connection did not work any more. As it seems, the file /etc/resolv.conf was static and contained wrong data assigned by the NetworkManager. When I changed the file content manually to nameserver 127.0.0.53 DNS lookup worked fine. After reboot, however, I had to repeat this operation since NetworkManager seems to have replaced the file content. Finally, I found a solution. Running sudo dpkg-reconfigure resolvconf the file /etc/resolv.conf was replaced by the link /etc/resolv.conf -> ../run/resolvconf/resolv.conf Now, the wireless network seems to work properly. Hence, there must be some kind of bug during the update process from Ubuntu 17.04 to 17.10 that impedes resolvconf to be configured properly. Best regards, Artur ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: resolvconf 1.79ubuntu8 ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4 Uname: Linux 4.13.0-16-generic x86_64 ApportVersion: 2.20.7-0ubuntu3 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sat Oct 21 23:17:38 2017 InstallationDate: Installed on 2013-10-18 (1463 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) PackageArchitecture: all SourcePackage: resolvconf UpgradeStatus: Upgraded to artful on 2017-10-19 (1 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/resolvconf/+bug/1725840/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp