@drgrumpy can you test the resolvconf package from this ppa to see if it correctly fixes the problem for you (on a system where you haven't worked around this by disabling the 'resolvconf-pull-resolved' service/path, of course):
https://launchpad.net/~ddstreet/+archive/ubuntu/lp1817903 ** Description changed: [impact] systems upgraded from pre-Bionic releases to Bionic or later will continue to use ifupdown/resolvconf for network conf and management, but resolvconf has a new systemd service in Bionic and later that pulls systemd-resolved stub-resolv.conf into its local configuration. With the recent addition of edns0 option to the stub resolver conf in systemd to fix bug 1811471, this means resolvconf now sets up the /etc/resolv.conf file to include upstream servers but also use edns. For any systems where the upstream resolver(s) don't support edns, dns lookups will break. [test case] create a xenial system with ifupdown/resolvconf, then upgrade to bionic (alternately it should be possible to install bionic, then remove netplan and install/configure ifupdown and resolvconf). The system ifupdown config should include an upstream name server. After upgrade, the /etc/resolv.conf will contain both the upstream name server as well as options edns0. [regression potential] this changes how resolvconf handles system dns on bionic and later: 1) networking is managed by ifupdown resolvconf is currently adding the local stub resolver to /etc/resolv.conf, even though in this case it doesn't know about any upstream name servers. This change will remove the local stub resolver from /etc/resolv.conf; it should not be there. 2) networking is managed by systemd-networkd resolvconf is currently setting up /etc/resolv.conf to direct all local dns queries to the local stub resolver, similar to how systemd-resolved itself configures /etc/resolv.conf. This change will instead set up /etc/resolv.conf to bypass the local stub resolver, and send all dns queries to the upstream name server(s). In case #1, this change has little chance for regression; in case #2 however, this change will bypass the local stub resolver and thus create more network dns traffic (since dns queries will not be cached locally). However, this is how pre-Bionic releases worked, and simply removing resolvconf will restore systemd-resolved control of /etc/resolv.conf, causing the system to again use the local stub resolver. Additional regressions due to this change would likely be seen in dns query failures with other system configurations. [other info] + This affects only Bionic and later; in Xenial and earlier, resolvconf + does not include the 'resolvconf-pull-resolved' service to pull in the + systemd-resolved stub config, which is what causes this problem. + + This also does not affect Debian, as it does not include the + 'resolvconf-pull-resolved' service either. + original description: -- - Mint 19 (Ubuntu 18.04) Following latest mint update done on 24/02/2019, DNS is broken.... nslookup and dig of certain domain names work as expected, ping does not (ip works but not domain name) After a day of trial and error, testing I found that the problem lies with the presence of "options edns0" in /run/resolvconf/resolv.conf (link to by /etc/resolv.conf) With option present many dns lookups fail with both FF and chrome browswers and thunderbird... This is on a home network, with router set as dns proxy for external wan, not using NetworkManager Deleting the option on live system results in the issue immediately disappearing, but on reboot it is added back in (by systemd-resolve ?) I cannot find any option to prevent this being added, so presumably it is hard-coded in systemd following the update? systemd: Installed: 237-3ubuntu10.13 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1817903 Title: systemd-resolve appends "options edns0" to resolv.conf To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1817903/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
