Install PHP 8.1

Step 1 :- Press Alt+Ctrl+T

Step 2 :- sudo apt update

Step 3 :- sudo apt upgrade -y

Step 4 :- sudo add-apt-repository ppa:ondrej/php -y && sudo apt update && sudo apt upgrade -y && sudo apt install php8.1 libapache2-mod-php8.1 -y && sudo systemctl restart apache2 && sudo apt-get install -y php8.1-cli php8.1-common php8.1-mysql php8.1-zip php8.1-gd php8.1-mbstring php8.1-curl php8.1-xml php8.1-bcmath