gpg-agent 无法连接到守护进程 /usr/lib/gnupg/scdaemon

Question

如何解决我在日志中发现的这个错误：

set 04 09:56:37 hostname gpg-agent[PID]: can't connect to the daemon /usr/lib/gnupg/scdaemon: IPC connect call failed
set 04 09:56:38 hostname gpg-agent[PID]: can't connect to the daemon /usr/lib/gnupg/scdaemon: IPC connect call failed
set 04 09:56:39 hostname gpg-agent[PID]: can't connect to the daemon /usr/lib/gnupg/scdaemon: IPC connect call failed
set 04 09:56:40 hostname gpg-agent[PID]: can't connect to the daemon /usr/lib/gnupg/scdaemon: IPC connect call failed

Ubuntu版本：

Distributor ID: Ubuntu
Description:    Ubuntu 24.04.1 LTS
Release:        24.04
Codename:       noble

Answer 1

我检查了引用的文件，它丢失了：

$ ls -al /usr/lib/gnupg/scdaemon
ls: cannot access '/usr/lib/gnupg/scdaemon': No such file or directory

然后我查看

gpg-agent

手册。我发现了这个：

   --scdaemon-program filename
          Use program filename as the Smartcard daemon.  The default is installation  
          dependent and can be shown  with  the gpgconf command.

和

   --disable-scdaemon
          Do not make use of the scdaemon tool.  This option has the effect of 
          disabling the ability to do smartcard operations.  Note, that enabling
          this option at runtime does not kill an already forked scdaemon.

因为我不使用任何智能卡硬件，所以不需要任何 scdaemon。

$ systemctl --user --full edit gpg-agent.service

将

--disable-scdaemon

添加到

ExecStart

：

[Unit]
Description=GnuPG cryptographic agent and passphrase cache
Documentation=man:gpg-agent(1)
Requires=gpg-agent.socket

[Service]
ExecStart=/usr/bin/gpg-agent --supervised --disable-scdaemon
ExecReload=/usr/bin/gpgconf --reload gpg-agent

重新加载配置：

$ systemctl --user reload gpg-agent.service

重启服务：

$ systemctl --user restart gpg-agent.service

最终如果

restart

没有响应：

$ killall -9 gpg-agent

systemctl 将使用新选项重新启动代理。