You are using a fallback implementation of the intl extension. Installing the native one is highly recommended instead. at /usr/share/nginx/html/nextcloud/3rdparty/patchwork/utf8/src/Patchwork/Utf8/Bootup/intl.php
请问怎么解决

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安装php-intl模块然后重启php-fpm之类的CGI服务管理器即可解决，官方论坛有同样的问题可以参考。