install composer ubuntu
sudo apt update sudo apt install php-cli unzip cd ~ curl -sS https://getcomposer.org/installer -o composer-setup.php HASH=`curl -sS https://composer.github.io/installer.sig` echo $HASH php -r "if (hash_file('SHA384', 'composer-setup.php') === '$HASH') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;" sudo php composer-setup.php --install-dir=/usr/local/bin --filename=composer composer apt search mbstring sudo apt install php-mbstring