[Bug 1712283] Re: Cannot resolve DNS in artful daily

[Reiner Jung]

I have the same issue. A couple of month ago we had a similar issue, which could be fixed by "downgrading" the resolver setup for systemd. However, the issue returned a couple of days ago.
In general networking works after start up, but stops after a random time period. When I "turn off" the connection and then turn it on again, it works again for some time before it breaks down again. 

This only affects DNS, as media streams and running connections are not
affected. The time interval range from 1-2 minutes up to an hour.

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https://bugs.launchpad.net/bugs/1712283

Title:
  Cannot resolve DNS in artful daily

Status in casper package in Ubuntu:
  Confirmed
Status in livecd-rootfs package in Ubuntu:
  Confirmed
Status in netcfg package in Ubuntu:
  Confirmed
Status in network-manager package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  Fix Released

Bug description:
  in the current daily 21 Aug 2017, I can ping 8.8.8.8 from a live
  session / installed session - running on virtualbox 5.1.26.

  However I cannot ping google.com - "Name or service not known"

  Kind of difficult to run ubuntu-bug here without a fully functioning
  network.

  Happy to provide more details - please can someone guide me producing
  a much better bug-report?

  ----

  my zesty VM is working just fine.  As of a week ago, my artful daily
  was working just fine also.

  ----

  
  * /etc/resolv.conf is empty file on most images built, which is not right, it should point to ../run/systemd/resolve/stub-resolv.conf. Should be fixed in image generation? systemd?

  * Adding a hack, to create /etc/resolv.conf if it does not exist, or
  is empty. src:systemd

  * network-manager does not consider that dns is managed by resolved if
  .53 is present in /etc/resolv.conf or if it points to stub-
  resolv.conf. src:network-manager

  * netcfg has integrtation w.r.t. /etc/resolv.conf and resolvconf.
  Needs checking / fixing

  * caster has resolvconf integration

  * livecd-rootfs has resolvconf integration

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