#install imagick
sudo apt-get install php-imagick
#check if installed
php -m | grep imagick
#restart your web server
sudo service apache2 restart
or
sudo service nginx restart

step 1
sudo apt update && sudo apt upgrade -y
step 2
sudo apt install php-imagick
step 3
if you using php version 7.4 use this command
sudo apt install php7.4-imagick
if you using php version 8.0 use this command
sudo apt install php8.0-imagick
step 4
php -m | grep imagick
after execute the above command output show like
imagick if the message does not show restart your xampp server or apache server