Thanks, Martin, for your suggestion.  That how-to, though, seems to head down a 
path I wanted to avoid: relying on the server machine as the networks DHCP 
service.

My effort instead was directed (by http://irclogs.ltsp.org/?d=2013-07-23) to 
run, at the client's initramfs prompt

nbd-client 192.168.0.202 -N /opt/ltsp/i386 /dev/nbd0


In the server machine's /var/log/syslog file, I get



nbd_server[5020]: Spawned a child process
nbd_server[5021]: virststyle ipliteral
nbd_server[5021]: connect from 192.168.0.102, assigned file is 
/opt/ltsp/images/i386.img
nbd_server[5021]: Can't open authorization file /etc/ltsp/nbd-server.allow (No 
such file or directory).
nbd_server[5021]: Starting to serve
nbd_server[5021]: Size of exported file/device is 299384832



On the client machine, 


Negotiation: ..size = 285MB
bs=1024, sz=299384832 bytes


and then back to the (initramfs) prompt - though it looks, from 
http://www.thegeekstuff.com/2009/02/nbd-tutorial-network-block-device-jumpstart-guide/,
 that instead of being returned to the prompt there, I should see "connected 
..."


Even after several minutes, there is no further indication of anything 
happening.  But if on the server I run

service nbd-server stop

then on the client machine I see

[  323.094338] block nbd0: Receive control failed (result -32)

as if by stopping the nbd-server, even after several minutes, I interrupted 
something.



----------------------------------------
> From: m.fu...@olpe.de
> To: ltsp-discuss@lists.sourceforge.net
> Date: Tue, 11 Mar 2014 06:55:02 +0000
> Subject: Re: [Ltsp-discuss] mounting /dev/nbd0 on /root failed: No such file 
> or directory
>
> Hi,
>
> try this howto:
> https://help.ubuntu.com/community/UbuntuLTSP/ltsp-pnp.
>
> Let me know if it works.
>
> Better try everything in a Virtualbox. Snapshots can be pretty handy :).
>
> Best regards
> Martin
>
> -----Ursprüngliche Nachricht-----
> Von: Larry Tucker [mailto:lat...@hotmail.com]
> Gesendet: Montag, 10. März 2014 21:15
> An: ltsp-discuss@lists.sourceforge.net
> Betreff: [Ltsp-discuss] mounting /dev/nbd0 on /root failed: No such file or 
> directory
>
> Hi happy readers of ltsp-discuss@lists.sourceforge.net
>
>
>
> After much effort to install ltsp and run a thin client for the first time, I 
> am stuck.
>
>
>
> Short story: when I boot the thin client, it stops with a message saying
>
> Error: Socket failed: Connection refused Exiting.
> modprobe: module unknown not found in modules.dep
> mount: mounting /dev/nbd0 on /root failed: No such file or directory
>

                                          
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