I just upgraded nbd-server (on my LTSP debian testing server) and
nbd-client (within my chroot image) and now I can boot the thin clients.
Seems like vagrant's fix has solved my problem, thank you.

Ref;

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=846998#27

from
Michael

On 29/03/17 17:38, Peter Tuharsky wrote:
> I got into the same problem after installation of Debian Stretch, that 
> is currently in RC stage.
>
> I applied settings from well-running Debian Jessie system. Everything 
> works, except NBD. I got the same symptoms, and in /var/log/syslog I read:
>
> Negotiation failed/8a: Requested export not found, or is TLS-only and 
> client did not negotiate TLS
>
> Does somebody have an idea, what's going on?
>
> Am I doing something wrong? Or is it some grave bug in Stretch that 
> should be reported?
>
>
> On 29.03.2017 07:41, Michael Pope wrote:
>> I'm running debian testing on my LTSP server and have just applied the
>> upgrades. It was working before the upgrades.
>>
>> I upgraded the server with
>>
>> sudo apt update
>>
>> sudo apt upgrade
>>
>> Then I upgraded the fat client
>>
>> sudo ltsp-chroot -m
>> sudo apt update
>> sudo apt upgrade
>> exit
>> sudo ltsp-update-image
>> sudo ltsp-update-kernels
>>
>> Now when I try to start a fat client I get the following error
>>
>> Negoatiation: ..Error: Read failed: End of file
>>
>> Exiting.
>>
>> Gave up waiting for root device. Common problems:
>>
>> - Boot args (cat /proc/cmdline)
>>
>>    Check rootdelay=
>>
>>    Check root
>>
>> - Missing modules
>>
>> ALERT! /dev/nbd0 does not exist . Dropping to shell!
>>
>>
>> Then I'm just stuck at busybox.
>>
>>
>> Tried the following two commands, but that didn't help
>> sudo ltsp-config nbd-server
>> sudo service nbd-server restart
>>
>> Tried adding nbd to the server
>> sudo modprobe nbd
>>
>> Now I can list /dev/nbd0 on the server, but still not boot the client.
>>
>>   
>>
>
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