Xcode 10更新 Error Domain=PKInstallErrorDomain Code=102 "The package “MobileDeviceDevelopment.pkg” is untrusted.

今天在copy xcode到另一个系统的时候，发现在install component的时候出现这个错误。

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Package: PKLeopardPackage <id=com.apple.pkg.MobileDeviceDevelopment, version=10.3.9000000000.1.1488876279, url=file:///Applications/Xcode.app/Contents/Resources/Packages/MobileDeviceDevelopment.pkg> Failed to verify with error: Error Domain=**PKInstallErrorDomain Code=102 "The package** “**MobileDeviceDevelopment.pkg” is untrusted**." UserInfo={NSLocalizedDescription=The package “MobileDeviceDevelopment.pkg” is untrusted., NSURL=MobileDeviceDevelopment.pkg -- file:///Applications/Xcode.app/Contents/Resources/Packages/, PKInstallPackageIdentifier=com.apple.pkg.MobileDeviceDevelopment, NSUnderlyingError=0x7fd455e42020 {Error Domain=NSOSStatusErrorDomain Code=-2147409654 "CSSMERR_TP_CERT_EXPIRED" UserInfo={SecTrustResult=5, PKTrustLevel=PKTrustLevelExpiredCertificate, NSLocalizedFailureReason=CSSMERR_TP_CERT_EXPIRED}}}

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当时就傻眼@@，有点奇怪，切换网路还有再次确认我丢过来的xcode是没问题的。

在stackoverflow 找到了解决办法，不过不清楚为什么？。？

解决方法：

将电脑的系统时间改成，2019/10/1 ，再安装就成功了...