gpg --generate-key
这是我收到的错误消息：
We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.
gpg: can't connect to the gpg-agent: IPC connect call failed
gpg: agent_genkey failed: No agent running
Key generation failed: No agent running