Ubuntu 18.04 - dnsmasq trouble

Hello,

We have been using ltsp for 10 years under Ubuntu.
We want to migrate to version 18.04 of Ubuntu.
After following the instructions on this post 
http://wiki.ltsp.org/wiki/Installation/Ubuntu, we do not encounter any
major problem and the thin clients start perfectly.

However, we need to use a dnsamasq feature to make local name
resolution for some domains and CNAME.
We have disabled the port = 0 option in the dnsmasq.conf file.
After none of the thin clients will work. The boot sequence stops with
the message 'block nbd0 connexion timed out'.

Do you have a solution to bring us?

Best regards


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