"curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -" then i got error "curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to 172.31.1.3:8080" "gpg: no valid OpenPGP data found." this
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This worked for me:
curl -O https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add gpg

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