Problem
According to the document step by step, in fact, I in Ubuntu server down like this is no problem, and then in desktop
sudo add-apt-repository \
"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable"When we find this step, we will make mistakes.
W: Failed to fetch https://download.docker.com/linux/ubuntu/dists/bionic/InRelease Could not wait for server fd - select (11: Resource temporarily unavailable) [IP: 13.35.121.111 443]
W: Some index files failed to download. They have been ignored, or old ones used instead.Ubuntu is 18.04
Although it has been a long time in the past, we have encountered this problem today and solved it by setting up an agent.
# Set up agent first export http_proxy=http://<proxy>:<port> export https_proxy=http://<proxy>:<port> # add ` -E' when executing the command `sudodad-apt-repository' sudo -E add-apt-repository \ "deb [arch=amd64] https://download.docker.com/linux/ubuntu \ $(lsb_release -cs) \ stable"