** Description changed:

  The libnss-resolve postinst script inserts ‘resolve’ before ‘dns’ in the
  hosts line of /etc/nsswitch.conf.  This makes DNSSEC validation
  impossible, even with DNSSEC=yes in /etc/systemd/resolved.conf, because
  if libnss_resolve returns a validation failure, glibc will simply fall
  back to libnss_dns.  It also makes NXDOMAIN lookups twice as slow.
- 
- The following syntax would preserve the fallback in the case that
- systemd-resolved is not running at all, but allow systemd-resolved to
- fail lookups that should fail when it is running:
- 
- hosts:          files resolve [!TRYAGAIN=return] dns

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https://bugs.launchpad.net/bugs/1624071

Title:
  libnss-resolve: Fallback from resolve to dns breaks DNSSEC validation

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