ERROR:you are using a fallback implementation of the intl extension

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error: php You are using a fallback implementation of the intl extension. Installing the native one is highly recommended instead. at /var/www/nextcloud/3rdparty/patchwork/utf8/src/Patchwork/Utf8/Bootup/intl.php#18

why?error?

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You need to enable to the intl php module.
For example:

DeepinScreenshot_select-area_20180919200200
DeepinScreenshot_select-area_20180919200200677×788 47.5 KB

See also: Error PHP You are using a fallback implementation of the intl extension. · Issue #10655 · nextcloud/server · GitHub

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Or on the Linux command line:

sudo apt install php7.2-intl
phpenmod intl
systemctl restart apache2
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For debian distros:

sudo apt-get install php7.3-intl
sudo phpenmod intl
sudo systemctl restart apache2.service

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