Thank for your kindly reply.
I have read that wiki many time before when I first time try to install custom-mods.
But I found the wiki description have little difference with my Ubuntu Linux machine.
Maybe was because my minetest was installed by ubuntu software center.
Also using manual update from 0.4.12 to 0.4.13 version.
All my custom-mods/mod-packs (animals/tech/pipework/morexxxxx... and many mods) are installed in /usr/share/games/minetest/mods after I do many research and try & error. All other mods/mod-packs are working fine now.
Anyway, I have try to put the wine mod either
/usr/share/games/minetest/mods
or
/var/games/minetest-server/.minetest/mods
both have same result.
I can craft all stuff. I can place.... but just can't see the correctly image.
The only message I get was
By the way..... My server machine was at location 1 (city a) with ip a.a.a.a (isp 1)
And my client machine was at location 2,3,4,5 (city b, c , d ) with ip b.b.b.b/c.c.c.c/d.d.d.d (isp 1, isp2, isp3)... for my family and firends.
so, It's not that case of client/server at same machine.