备份并移除老的cacerts
sudo mv /etc/ssl/certs/java/cacerts{,.backup} sudo mv /etc/ssl/certs/java/ca
sudo mv /etc/ssl/certs/java/cacerts{,.backup} sudo mv /etc/ssl/certs/java/ca
阅读背景：
ubuntu18.04安装nutstroe提示连接ssh错误解决办法
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