This is one line command to install docker on Ubuntu 20.04.
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| apt update -y && \
apt install -y apt-transport-https ca-certificates curl software-properties-common && \
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - && \
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable" && \
apt update -y && \
apt install -y docker-ce
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This command line has been verified on Ubuntu20.04.
This will speed up deploying a fresh vps process. That is why I write all command in one line.