Installing libnl 3.2.27-1 on LM/Ubuntu-Xenial disables net interfaces

[Mel Brands]

Hi Jef,
Thank you for reading & replying!

I don't think that this change would have affected me since I'm pretty
sure that the version that ubuntu xenial base ships with has libnl
that old. The install on this machine is about a month old. That also
wouldn't explain occasional missing network interfaces after a reboot.

I'm not sure what the root cause is.

On Fri, Sep 23, 2016 at 9:06 PM, Jef Oliver <jef at eljef.me> wrote:
> There was an ABI break, I believe around 3.2.22->3.2.23. If you go from
> 3.2.21 to the newest, this could be the problem. Don't hold me to this
> though.
>
> On Fri, Sep 23, 2016 at 3:23 PM, Mel Brands <bighype at gmail.com> wrote:
>> Hi all,
>>
>> Ever since I upgraded to new Linux 4.4..0-x series of kernels, I've
>> had unexplained network troubles. About 1 in 5 reboots would result in
>> network interfaces being down and I was getting "The system network
>> services are not compatible with this version." from NetworkManager. I
>> used to "resolve" that error by rebooting... since none of the network
>> troubleshooting methods worked for me.
>>
>> After I upgraded to 4.4.0-38-generic kernel, not even a reboot would
>> bring network interfaces up. I finally did some searching and it turns
>> out that libnl is the culprit.
>>
>> You can see other reports here for example:
>> https://askubuntu.com/questions/727988/the-system-network-services-are-not-compatible-with-this-version-ubuntu-14-0
>>
>> The solution offered above is to downgrade libnl to 3.2.21-1. I can
>> confirm that this works and my network interfaces work after reboots.
>> Judging by the dates of the posts above, it seems that this issue has
>> persisted for years.
>>
>> Since I don't like running old network packages, I'm hoping that
>> someone here can tell me what's wrong and how I can fix this. I'm
>> willing to help with tracking down the issue.
>>
>> Thank you!
>> Mel
>>
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