debconf: unable to initialize frontend: Dialog

apt update 시

debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)
debconf: falling back to frontend: Readline

위와 같은 메시지가 나올 경우 아래의 패키지를 설치해 준다.

apt -y install dialog