Para a
sudo apt update
1.1 Instalar php7.4 e bibliotecas necessárias
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt list --upgradable
sudo apt-get upgrade
sudo apt install php7.4 -y
sudo apt install libapache2-mod-php7.4 -y
sudo apt install php7.4-curl -y
sudo apt install php7.4-intl -y
sudo apt install php7.4-zip -y
sudo apt install php7.4-soap -y
sudo apt install php7.4-xml -y
sudo apt install php7.4-gd -y
sudo apt install php7.4-mbstring -y
sudo apt install php7.4-bcmath -y
sudo apt install php7.4-common -y
sudo apt install php7.4-xml -y
sudo apt install php7.4-mysqli -y
1.2 Habilitando mods do apache2 para trabalhar com o PHP7.4
a2enmod php7.4
1.3 Reescreve os mods
a2enmod rewrite
1.4 Restart do apache2
sudo service apache2 restart
ou
systemctl restart apache2