Trying to install the phpize extension on the Ubuntu php8.1

Question

I am trying to install the phpize on Ubuntu 20.04 PHP 8.1

I tried following commands but no luck

1. sudo apt-get install php8.0-dev

E: Unable to locate package php8.0-dev
E: Couldn't find any package by glob 'php8.0-dev'
E: Couldn't find any package by regex 'php8.0-dev'

2. sudo apt-get install php-dev

 php-dev : Depends: php7.4-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

3. sudo apt-get install php8.1-dev

E: Couldn't find any package by glob 'php8.1-dev'
E: Couldn't find any package by regex 'php8.1-dev'

Answer 1

sudo apt update && apt install -y software-properties-common 
sudo add-apt-repository ppa:ondrej/php 
sudo apt update and then try