when doing the same with nbd-client 1:3.1-1, I get an error:
sudo nbd-client 192.168.43.181 -N /opt/ltsp/i386 /dev/nbd0
E: Server does not support listing exports
using "-N anything" fails similarly.
the server configuration is the default configuration:
# If you want to run everything as root rather than the nbd user, you
# may either say "root" in the two following lines, or remove them
# altogether. Do not remove the [generic] section, however.
user = nbd
group = nbd
includedir = /etc/nbd-server/conf.d
# What follows are export definitions. You may create as much of them as
# you want, but the section header has to be unique.
with two files in /etc/nbd-server/conf.d, ltsp_i386.conf: