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Apt
,→non interactive로 설치
==non interactive로 설치==
$ export DEBIAN_FRONTEND=noninteractive && apt-get install -y postfix
==non-free 추가==
/etc/apt/sources.list 파일을 다음과 같이 수정한다.
예시는 데비안 10(buster)이다.
<syntaxhighlight lang="text">
deb http://deb.debian.org/debian buster main non-free
deb-src http://deb.debian.org/debian buster main non-free
deb http://deb.debian.org/debian-security/ buster/updates main non-free
deb-src http://deb.debian.org/debian-security/ buster/updates main non-free
deb http://deb.debian.org/debian buster-updates main non-free
deb-src http://deb.debian.org/debian buster-updates main non-free
</syntaxhighlight>