Replace or keep existing configuration files during Linux updates/upgrades

During updating/upgrading a fresh Moebius installation on a RaspberryPi with

apt-get update && apt-get upgrade

it brought this question:

Configuration file `/etc/issue'

==> Modified (by you or by a script) since installation.

==> Package distributor has shipped an updated version.

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.

*** issue (Y/I/N/O/D/Z) [default=N] ?

The default hint not to do that is mainly for longer running installations to avoid an overwriting of existing configuration files. In case of a fresh installation you should confirm with “Y”.