I'm receiving the error in the title and I'm not sure why. I'm trying to run a docker container in Unraid. The dockerfile code is down below if anyone would like to critique.
ENV DEBIAN_FRONTEND=noninteractive \
LANG=en_US.UTF-8 \
LANGUAGE=en_US.UTF-8 \
LC_ALL=en_US.UTF-8 \
TERM=xterm \
TZ=:/etc/localtime \
PATH=$PATH:/usr/local/go/bin \
GOBIN=/go/bin \
APP=/go/src/smugmug-backup
RUN sed -e "/deb-src/d" -i /etc/apt/sources.list \
&& apt-get update \
&& apt-get install --no-install-recommends --yes \
ca-certificates \
&& apt-get clean \
&& rm -rf /.root/cache \
&& rm -rf /var/lib/apt/lists/*