Getting error while building the following Docker file
FROM ubuntu:21.04
RUN apt-get update &&
apt-get install –no-install-recommends -y curl=7.* &&
apt-get install –no-install-recommends -y unzip=6.* &&\
rm -rf /var/lib/apt/lists/*
RUN apt-get update &&
mkdir -p /usr/share/man/man1 &&
apt-get install –no-install-recommends -y maven=3.6.3-5 &&
apt-get clean &&
rm -rf /var/lib/apt/lists/*
The error occurs when the second apt-get update runs.
The error is as follows :-
E: The repository 'http://security.ubuntu.com/ubuntu hirsute-security InRelease' is not signed.
W: GPG error: http://archive.ubuntu.com/ubuntu hirsute InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://archive.ubuntu.com/ubuntu hirsute InRelease' is not signed.
W: GPG error: http://archive.ubuntu.com/ubuntu hirsute-updates InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://archive.ubuntu.com/ubuntu hirsute-updates InRelease' is not signed.
W: GPG error: http://archive.ubuntu.com/ubuntu hirsute-backports InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://archive.ubuntu.com/ubuntu hirsute-backports InRelease' is not signed.
Any kind of help would be appreciated.