In Ubuntu, the location of the php.ini file can vary depending on the installation and version of PHP you are using, as well as the web server you are using. Here are a few common locations where you can find the php.ini file:
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/etc/php/7.4/apache2/php.ini This is the default location for the php.ini file for PHP version 7.4 on Apache web server.
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/etc/php/7.4/cli/php.ini This is the php.ini file used by the PHP command-line interface (CLI).
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/usr/local/etc/php/php.ini This is the location for the php.ini file on some installations of PHP.