nguyendachuy

Reading package lists... Done
E: The repository 'https://ppa.launchpadcontent.net/ondrej/php/ubuntu mantic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

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cd /etc/apt/sources.list.d/
nano ondrej-ubuntu-php-mantic.sources