Could you please add some quick clarifications for this Thomas? Might be
good for all users.

1) The message (as of today’s dist-upgrade) still shows critical error -
while I understand it is an warning. Many threads discuss this problem.
Is this correct, is dist-upgrade related problems in this case a
Critical Error or is it a Warning?

2) On ubuntu cloud clones (e.g., amazon elastic builds) will this break
any resolvconf functionality not intended by the clone
administrator/creator. I.e., the person(s) hard-coding the
/etc/resolv.conf file (not symlink) with information, or will it
continue to work without properly (defaulting to prior 12.04 config
files etc).

3) The resolveconf system is often bundled with kernel updates. If I
accept this Error as a Warning and see broken updates in apt, will I
then be able to update to later kernels?

4) added as "fix released" in some related bugs (incomplete here) while
upgrade process from version x to y (distributions) are likely to
produce these errors - this is incorrect.

Note: I specifically need kernel updates to nfs servers and it has
dependencies on resolvconf in the update packages (from what I can
understand from apt-get -s).

INFO:

1) uname -a
Linux ip-10-39-8-203 3.2.0-35-virtual #55-Ubuntu SMP Wed Dec 5 18:02:05 UTC 
2012 x86_64 x86_64 x86_64 GNU/Linux

2) sudo dpkg-reconfigure DOES NOT WORK or chattr (all with many reboots)

3) cannot set immutable bit easily (standard amazon elastic clone).
However, with hacks from https://bugs.launchpad.net/ubuntu/+bug/1003595
I can make it use a symlink. Still dist-upgrade and dpkg reconf. process
fails with error.

4) nr 3 hacks works despite output (symlink present after reboot with
same info as before adding symling):

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 172.16.0.23
search eu-west-1.compute.internal

5) ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 29 Jun 16  2012 /etc/resolv.conf -> 
../run/resolvconf/resolv.conf

related:

https://bugs.launchpad.net/ubuntu/+source/resolvconf/+bug/1000244
https://bugs.launchpad.net/ubuntu/+bug/1003595

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https://bugs.launchpad.net/bugs/1000244

Title:
  Symlink /etc/resolv.conf does not exist after installation or upgrade
  of resolvconf -- various causes

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