我在 Ubuntu 上使用 dirmngr 服务。运行服务时，我在日志文件中看到以下错误：
2015-09-29 09:37:45 dirmngr[25550.0] oops: ksba_cert_hash failed: No value
2015-09-29 09:37:45 dirmngr[25550.0] error loading certificate `/etc/dirmngr/trusted-certs/clientCA.crt': Invalid certificate object
2015-09-29 09:37:45 dirmngr[25550.0] oops: ksba_cert_hash failed: No value
2015-09-29 09:37:45 dirmngr[25550.0] error loading certificate `/etc/dirmngr/trusted-certs/client1.crt': Invalid certificate object
2015-09-29 09:37:45 dirmngr[25550.0] oops: ksba_cert_hash failed: No value
2015-09-29 09:37:45 dirmngr[25550.0] error loading certificate `/etc/dirmngr/trusted-certs/ca.crt': Invalid certificate object
2015-09-29 09:37:45 dirmngr[25550.0] oops: ksba_cert_hash failed: No value
2015-09-29 09:37:45 dirmngr[25550.0] error loading certificate `/etc/dirmngr/trusted-certs/trustca.crt': Invalid certificate object
2015-09-29 09:37:45 dirmngr[25550.0] oops: ksba_cert_hash failed: No value
2015-09-29 09:37:45 dirmngr[25550.0] error loading certificate `/etc/dirmngr/trusted-certs/udidlab_root_trust.crt': Invalid certificate object
2015-09-29 09:37:45 dirmngr[25550.0] permanently loaded certificates: 0
2015-09-29 09:37:45 dirmngr[25550.0] runtime cached certificates: 0
此外，在运行守护程序时，输出如下：
root@ubuntu151:/etc/dirmngr/trusted-certs# dirmngr --allow-ocsp
dirmngr[25773.0]: error opening `/root/.gnupg/dirmngr_ldapservers.conf': No such file or directory
dirmngr[25773.0]: permanently loaded certificates: 0
dirmngr[25773.0]: runtime cached certificates: 0
# Home: ~/.gnupg
# Config: [none]
OK Dirmngr 1.1.1 at your service
知道为什么吗？
谢谢。