Thank you for this answer. It's a first step to resolv my problem.
Do you have the official way to Inactive the template.
In this help guide :
"To modify a template, you will need first to find it.
Templates live under the directory "/usr/share/ebox/stubs/[module name]",
normally they have the same name than the configuration file with the extension ".mas" appended to it."
What is the name of the module for : etc/network/interfaces , please ?
And what writting in it ?
I found in /usr/share/ebox/stubs/network/ :
chap-secrets.mas
ddclient.mas
dsl-provider.mas
pap-secrets.mas
rt-tables.mas
ddclient.conf.mas
dhclient.conf.mas
jnettop.conf.mas
resolv.conf.mas
I opened all of them, but I'm beguining in linux . So ....
Thanks for help