[Bug 1845793] Re: Since upgrade to ubuntu 19.10, dhclient doesn't respect the "supersede domain-name-servers" in dhclient.conf

[Wolf Pichler]

This could have the same reason as the bug filed by me:
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1882797

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https://bugs.launchpad.net/bugs/1845793

Title:
  Since upgrade to ubuntu 19.10, dhclient doesn't respect the "supersede
  domain-name-servers" in dhclient.conf

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  dnsleaktest.com shows my ISP servers instead of the configured ones in
  dnscrypt-proxy. When i checked in network settings it was written the
  DNS for my router, but there is still this line below inside
  /etc/dhcp/dhclient.conf. Also, ifconfig shows that the interface name
  is still the same as below.

  interface "wlp3s0" {
      supersede domain-name-servers 127.0.0.1;
  }

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: isc-dhcp-client 4.4.1-2ubuntu5
  ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
  Uname: Linux 5.3.0-13-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Sep 28 19:40:14 2019
  DhclientLeases:
   
  InstallationDate: Installed on 2019-07-23 (66 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: isc-dhcp
  UpgradeStatus: Upgraded to eoan on 2019-09-27 (0 days ago)
  mtime.conffile..etc.dhcp.dhclient.conf: 2019-08-31T22:54:40.376662

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