$ apt update
=> error
$ sudo wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
$ sudo apt-key add /etc/apt/trusted.gpg.d/php.gpg
$ apt update
=> ( ͡ °~͡° )
$ apt update
=> error
$ sudo wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
$ sudo apt-key add /etc/apt/trusted.gpg.d/php.gpg
$ apt update
=> ( ͡ °~͡° )