如何修复错误：gpg：密钥服务器接收失败：没有可用的密钥服务器？

Question

我总是收到以下 gpg 错误消息。我也尝试从 webupd8 添加 PPA，但结果是一样的。我该如何解决这个错误？

user@work:~$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 0DF731E45CE24F27EEEB1450EFDC8610341D9410
Executing: /tmp/apt-key-gpghome.VlEePwgr6J/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 0DF731E45CE24F27EEEB1450EFDC8610341D9410
gpg: keyserver receive failed: No keyserver available

user@work:~$ sudo apt-key adv -vv --keyserver hkp://keyserver.ubuntu.com:80/ --recv-keys 0DF731E45CE24F27EEEB1450EFDC8610341D9410
[sudo] password for deda: 
Executing: /tmp/apt-key-gpghome.Z1cpSvPrvA/gpg.1.sh -vv --keyserver hkp://keyserver.ubuntu.com:80/ --recv-keys 0DF731E45CE24F27EEEB1450EFDC8610341D9410
gpg: no running Dirmngr - starting '/usr/bin/dirmngr'
gpg: waiting for the dirmngr to come up ... (5s)
gpg: connection to the dirmngr established
gpg: keyserver receive failed: No keyserver available 

Answer 1

我尝试更新到 Mono 6 时遇到此错误。我通过在命令中从 切换keyserver.ubuntu.com到 来解决它。keys.gnupg.netapt-key