debian install locale / change default locale

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change debian default install interactive locale locales non setup

sudo debconf-set-selections -u <<"EOF"
locales locales/locales_to_be_generated multiselect de_DE.UTF-8 UTF-8, en_US.UTF-8 UTF-8
locales locales/default_environment_locale select de_DE.UTF-8
EOF

sudo dpkg-reconfigure -f noninteractive locales