The -y moved to upfront

Dockerfile

@@ -1,6 +1,6 @@
 FROM ubuntu:18.04
 
-RUN apt-get -y update && apt-get -y upgrade && apt-get install -y gnupg2 wget
+RUN apt-get -y update && apt-get -y upgrade && apt-get -y install gnupg2 wget
 
 RUN wget -q https://www.postgresql.org/media/keys/ACCC4CF8.asc -O - | apt-key add - 
 RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" > /etc/apt/sources.list.d/pgdg.list
@@ -14,7 +14,7 @@ RUN /etc/init.d/postgresql start &&\
 
 USER root
 
-RUN apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev git python-psycopg2 libpq-dev
+RUN apt-get -y install make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev git python-psycopg2 libpq-dev
 
 RUN curl -L https://raw.githubusercontent.com/yyuu/pyenv-installer/master/bin/pyenv-installer | bash