release upgrade breaks internet and other things

[Volker Wysk]

Zitat von Tom H <tomh0665 at gmail.com>:

> On Wed, Oct 3, 2018 at 7:27 PM Volker Wysk <post at volker-wysk.de> wrote:
>>
>> I've done a do-release-upgrade on my 16.04 LTS system. This has broken
>> the internet connection, and more. I get immediate "unknown host"
>> errors when I ping to any host. When I lookup an adress in Firefox, I
>> get a "Page not found, The connection to the server ... failed."
>>
>> Sorry, I don't know how to troubleshoot this connection problem.
>>
>> Where should I look..?
>>
>> Should i even look, or would it be easier to reinstall everything in a
>> new 18.04.1 system from scratch? (This would be quite a few things.)
>
> Previous upgrades with network problems turned out to be dns problems.
> /etc/resolv.conf" was a symlink pointing at the wrong file, IIRC.
>
> Is it a file or a symlink?
>
> If a symlink, to which file is it pointing?
>
> What are the name servers?

It's a symlink to /run/resolvconf/resolv.conf. Which is EMPTY. Looks  
like we have the culprit here.

It only contains this (commented out) note:

# 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

Bye
VW