在全新的 Ubuntu 16.04 安装中，我想使用 gpg 来加密我的数据库备份，但我无法gpg-agent正常工作。
postgres@db:~$ gpg -s test.txt
You need a passphrase to unlock the secret key for
user: "Nicolas Remond <nicolas@xxx.com>"
2048-bit RSA key, ID F5DECA47, created 2016-11-03
gpg: gpg-agent is not available in this session
Enter passphrase:
此外，似乎 gpg-agent 正在运行，就像我之前所做的那样：
postgres@db:~$ gpg-agent
gpg-agent[1715]: no gpg-agent running in this session
postgres@db:~$ gpg-connect-agent /bye
gpg-connect-agent: no running gpg-agent - starting '/usr/bin/gpg-agent'
gpg-connect-agent: waiting for the agent to come up ... (5s)
gpg-connect-agent: connection to agent established …