Ubuntu dockerfile - mailutils install
Use the following dockerfile:
FROM ubuntu:latestENV DEBIAN_FRONTEND="noninteractive"RUN apt-get update && apt-get install -y mailutilsThe important part is setting debconf to noninteractive mode.
You can also use this trick with something like
FROM ubuntu:latestRUN apt-get update && apt-get install -yRUN echo "postfix postfix/mailname string your.hostname.com" | debconf-set-selections &&\ echo "postfix postfix/main_mailer_type string 'Internet Site'" | debconf-set-selections &&\ apt-get install -y mailutils