> that impossible, because the /etc/default/unbound file is part of the
package.

That's actually not true - you can create /etc/default/unbound before
installing the package and the package will not overwrite the configfile
by default:

root@lettie:/# touch /etc/default/unbound

root@lettie:/# ls -l /etc/default/unbound
-rw-r--r-- 1 root root 0 Dec  5 09:43 /etc/default/unbound

root@lettie:/# apt-get install unbound
[...]
Setting up unbound (1.4.16-1) ...

Configuration file `/etc/default/unbound'
 ==> File on system created by you or by a script.
 ==> File also in package provided by package maintainer.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** unbound (Y/I/N/O/D/Z) [default=N] ? 
invoke-rc.d: policy-rc.d denied execution of start.
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place

root@lettie:/# ls -l /etc/default/unbound
-rw-r--r-- 1 root root 0 Dec  5 09:43 /etc/default/unbound


I don't think that the default configuration is "unsafe".  You are installing 
it in ***broken*** network, and thus you should modify your script to 
accommodate for the fact that the upstream resolver is broken.

Or just fix the upstream resolver, you should do that anyway.

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https://bugs.launchpad.net/bugs/988513

Title:
  unbound defaults break DNS resolution when upstream DNS lacks DNSSEC
  support

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https://bugs.launchpad.net/ubuntu/+source/unbound/+bug/988513/+subscriptions

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