[Bug 1308378] Re: No working network after 12.04 LTS -> 14.04 LTS upgrade if no /etc/resolv.conf in precise

[Timo Jyrinki]

Adjusted the description, I think there's a potential problem than can
handled better from user perspective.

The proposed branch adds upgrade) preinst rule for resolvconf < 1.64,
and creates the symlink if and only if /etc/resolv.conf does not exist
at all (normal file or symlink). I've tested that it does nothing when
upgrading from newer resolvconf, and also leaves /etc/resolv.conf
untouched if it exists as a normal file or a symlink, when upgrading
from the precise version. It fixes the issue I saw on upgrade.

** Summary changed:

- No working network (= name resolving) after 12.04 LTS -> 14.04 LTS upgrade
+ No working network after 12.04 LTS -> 14.04 LTS upgrade if no /etc/resolv.conf in precise

** Description changed:

- At least in my case, name resolving did not work after upgrading from
- precise to trusty.
+ Name resolving did not work after upgrading from precise to trusty.
  
  I fixed it manually with:
  cd /etc
  sudo ln -s /run/resolvconf/resolv.conf .
  
- There was no resolv.conf in /etc/ otherwise, but there was a
- /etc/resolv.conf.old which was a similar symlink to /run/.
- 
- In case this cannot be reproduced, it's possible I've created the
- problem myself, but I cannot say for sure if I've touched
- /etc/resolv.conf somehow. So please check /etc/resolv.conf* before and
- after dist-upgrade, and the functionality of the network.
+ It turns out 12.04 LTS works fine without /etc/resolv.conf, so that
+ increases the likelihoods that 12.04 LTS systems do not have that file.
+ When such a system is upgraded to 14.04 LTS, network seemingly stops
+ working to the user.

** Changed in: resolvconf (Ubuntu)
       Status: Invalid => New

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https://bugs.launchpad.net/bugs/1308378

Title:
  No working network after 12.04 LTS -> 14.04 LTS upgrade if no
  /etc/resolv.conf in precise

Status in “resolvconf” package in Ubuntu:
  New

Bug description:
  Name resolving did not work after upgrading from precise to trusty.

  I fixed it manually with:
  cd /etc
  sudo ln -s /run/resolvconf/resolv.conf .

  It turns out 12.04 LTS works fine without /etc/resolv.conf, so that
  increases the likelihoods that 12.04 LTS systems do not have that
  file. When such a system is upgraded to 14.04 LTS, network seemingly
  stops working to the user.

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