To enable extensions, verify that they are enabled in your .ini files: (Ubuntu 18.04, PHP 7.4)

Выполняю команду composer install, консоль выдаёт:

    - /etc/php/8.0/cli/php.ini
    - /etc/php/8.0/cli/conf.d/10-mysqlnd.ini
    - /etc/php/8.0/cli/conf.d/10-opcache.ini
    - /etc/php/8.0/cli/conf.d/10-pdo.ini
    - /etc/php/8.0/cli/conf.d/15-xml.ini
    - /etc/php/8.0/cli/conf.d/20-bz2.ini
    - /etc/php/8.0/cli/conf.d/20-calendar.ini
    - /etc/php/8.0/cli/conf.d/20-ctype.ini
    - /etc/php/8.0/cli/conf.d/20-curl.ini
    - /etc/php/8.0/cli/conf.d/20-dom.ini
    - /etc/php/8.0/cli/conf.d/20-exif.ini
    - /etc/php/8.0/cli/conf.d/20-ffi.ini
    - /etc/php/8.0/cli/conf.d/20-fileinfo.ini
    - /etc/php/8.0/cli/conf.d/20-ftp.ini
    - /etc/php/8.0/cli/conf.d/20-gd.ini
    - /etc/php/8.0/cli/conf.d/20-gettext.ini
    - /etc/php/8.0/cli/conf.d/20-iconv.ini
    - /etc/php/8.0/cli/conf.d/20-igbinary.ini
    - /etc/php/8.0/cli/conf.d/20-intl.ini
    - /etc/php/8.0/cli/conf.d/20-mbstring.ini
    - /etc/php/8.0/cli/conf.d/20-mysqli.ini
    - /etc/php/8.0/cli/conf.d/20-pdo_mysql.ini
    - /etc/php/8.0/cli/conf.d/20-phar.ini
    - /etc/php/8.0/cli/conf.d/20-posix.ini
    - /etc/php/8.0/cli/conf.d/20-readline.ini
    - /etc/php/8.0/cli/conf.d/20-redis.ini
    - /etc/php/8.0/cli/conf.d/20-shmop.ini
    - /etc/php/8.0/cli/conf.d/20-simplexml.ini
    - /etc/php/8.0/cli/conf.d/20-sockets.ini
    - /etc/php/8.0/cli/conf.d/20-sysvmsg.ini
    - /etc/php/8.0/cli/conf.d/20-sysvsem.ini
    - /etc/php/8.0/cli/conf.d/20-sysvshm.ini
    - /etc/php/8.0/cli/conf.d/20-tokenizer.ini
    - /etc/php/8.0/cli/conf.d/20-xmlreader.ini
    - /etc/php/8.0/cli/conf.d/20-xmlwriter.ini
    - /etc/php/8.0/cli/conf.d/20-xsl.ini
    - /etc/php/8.0/cli/conf.d/20-zip.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

Команды sudo apt-get install php7.2-gd, sudo apt-get install php7.2-intl, sudo apt-get install php7.2-xsl, sudo apt-get install php7.2-zip, sudo apt-get install php7.2-mbstring выполнял

PHP 7,4 FPM