Public bug reported: Initial symptom: DNS stopped working. Initial workaround: copy DNS server from gnome system settings to /etc/resolv.conf manually Got fed up, saw https://ubuntuforums.org/showthread.php?t=2374857 which led me to https://askubuntu.com/questions/622470/dns-probe-finished-bad-config-error-in-ubuntu-14-04/622493#622493
To reproduce: 0) observe that /etc/resolv.conf is a symlink to ../run/resolvconf/resolv.conf (I assume) 1) sudo apt install openvpn 2) configure /etc/openvpn to access the vpn of interest 3) Log in to openvpn, e.g. cd /etc/openvpn sudo openvpn --config /etc/openvpn/openvpn.conf --script-security 2 4) observe that /etc/resolv.conf is now a regular file 5) observe that 'sudo resolvconf -u' says '/etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf`' 6) log out of openvpn by pressing ^C in its window 7) observe that /etc/resolv.conf is still a regular file (probably a copy of what was in ../run/resolvconf/resolv.conf before starting openvpn) 8) Reboot 9) voila, dns not working 10) rescue by running sudo dpkg-reconfigure resolvconf, answering 'yes' (and optionally rebooting) Problem repeats each time openvpn is used. Also affects ubuntu 16.04, I think, at least as of the last few weeks. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: openvpn 2.4.3-4ubuntu1 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: Wed Oct 25 07:08:15 2017 InstallationDate: Installed on 2017-04-29 (179 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: openvpn UpgradeStatus: Upgraded to artful on 2017-10-20 (5 days ago) mtime.conffile..etc.default.openvpn: 2017-04-29T05:55:25.168266 ** Affects: openvpn (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug artful wayland-session -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1727368 Title: starting openvpn, quitting, and then doing 'sudo resolvconf -u ' fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openvpn/+bug/1727368/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs