[Bug 1787374] [NEW] resolvconf fails to update DNS server after resuming laptop from suspend

[pureblood]

Public bug reported:

This bug has been present since I have updated to Ubuntu 17.10 and it is
still present in Ubuntu 18.04. It seems pretty simple to understand and
a solution should be straightforward, but I lack understanding for what
application is failing to update the right configuration file.

When I go to work and I start my laptop, my /run/resolvconf/interface/systemd-resolved is filled with this:
nameserver 127.0.0.53
search broadinstitute.org plc.hootoo.com

When I come back home, DNS resolution does not work or works very
slowly, most likely because my work DNS server broadinstitute.org is not
reachable anymore, or maybe it is reachable but it is excruciatingly
slow at responding.

The solution is for me to edit /run/resolvconf/interface/systemd-resolved and remove the work DNS server:
nameserver 127.0.0.53
search plc.hootoo.com

And then update /etc/resolv.conf with the following command:
$ sudo /etc/init.d/resolvconf restart

Alternatively, another solution is to reboot the laptop. Then everything
works fine. This is clearly a bug, but I am not sure whether it is a
NetworkManager's bug, a resolvconf's bug, or a systemd bug. Please help!
:-)

** Affects: resolvconf (Ubuntu)
     Importance: Undecided
         Status: New

** Package changed: systemd (Ubuntu) => resolvconf (Ubuntu)

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https://bugs.launchpad.net/bugs/1787374

Title:
  resolvconf fails to update DNS server after resuming laptop from
  suspend

Status in resolvconf package in Ubuntu:
  New

Bug description:
  This bug has been present since I have updated to Ubuntu 17.10 and it
  is still present in Ubuntu 18.04. It seems pretty simple to understand
  and a solution should be straightforward, but I lack understanding for
  what application is failing to update the right configuration file.

  When I go to work and I start my laptop, my /run/resolvconf/interface/systemd-resolved is filled with this:
  nameserver 127.0.0.53
  search broadinstitute.org plc.hootoo.com

  When I come back home, DNS resolution does not work or works very
  slowly, most likely because my work DNS server broadinstitute.org is
  not reachable anymore, or maybe it is reachable but it is
  excruciatingly slow at responding.

  The solution is for me to edit /run/resolvconf/interface/systemd-resolved and remove the work DNS server:
  nameserver 127.0.0.53
  search plc.hootoo.com

  And then update /etc/resolv.conf with the following command:
  $ sudo /etc/init.d/resolvconf restart

  Alternatively, another solution is to reboot the laptop. Then
  everything works fine. This is clearly a bug, but I am not sure
  whether it is a NetworkManager's bug, a resolvconf's bug, or a systemd
  bug. Please help! :-)

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