Problems I Solved

I tried to setup GPG in a Linux server and met problems when performing commands that require passphrase. It turns out that I have to set the GPG_TTY to tell gpg-agent that it should ask password from current console.

First kill the gpg-agent. Because it may already hang in the background to wait for a password.

pkill -9 gpg-agent

Then set the environment variable for the current session

export GPG_TTY=$(tty)

Or save it for future sessions

echo 'export GPG_TTY=$(tty)' >> ~/.profile

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