SSL/TLS證書->高級設定->選擇你的證書
證書：

-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

CA證書：

-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

貼上去就好了；然後你的問題真的跟Linux沒啥關係，比起PKI Linux更喜歡用GPG…