When install Drupal with composer by command:

composer create-project drupal/recommended-project ./drupal

Then, these output is encountered:

Installing drupal/recommended-project (9.0.3)

    Failed to download drupal/recommended-project from dist: The zip extension and unzip command are both missing, skipping.

Your command-line PHP is using multiple ini files. Run `php --ini` to show them.

    Now trying to download from source

  - Installing drupal/recommended-project (9.0.3): Cloning 17ed885c64 from cache

Created project in drupal9

Loading composer repositories with package information

Installing dependencies (including require-dev) from lock file

Your requirements could not be resolved to an installable set of packages.

  Problem 1

    - Installation request for drupal/core 9.0.3 -> satisfiable by drupal/core[9.0.3].

    - drupal/core 9.0.3 requires ext-gd * -> the requested PHP extension gd is missing from your system.

  Problem 2

    - drupal/core 9.0.3 requires ext-gd * -> the requested PHP extension gd is missing from your system.

    - drupal/core-recommended 9.0.3 requires drupal/core 9.0.3 -> satisfiable by drupal/core[9.0.3].

    - Installation request for drupal/core-recommended 9.0.3 -> satisfiable by drupal/core-recommended[9.0.3].

  To enable extensions, verify that they are enabled in your .ini files:

    - /etc/php/7.4/cli/php.ini

    - /etc/php/7.4/cli/conf.d/10-opcache.ini

    - /etc/php/7.4/cli/conf.d/10-pdo.ini

    - /etc/php/7.4/cli/conf.d/15-xml.ini

    - /etc/php/7.4/cli/conf.d/20-calendar.ini

    - /etc/php/7.4/cli/conf.d/20-ctype.ini

    - /etc/php/7.4/cli/conf.d/20-dom.ini

    - /etc/php/7.4/cli/conf.d/20-exif.ini

    - /etc/php/7.4/cli/conf.d/20-ffi.ini

    - /etc/php/7.4/cli/conf.d/20-fileinfo.ini

    - /etc/php/7.4/cli/conf.d/20-ftp.ini

    - /etc/php/7.4/cli/conf.d/20-gettext.ini

    - /etc/php/7.4/cli/conf.d/20-iconv.ini

    - /etc/php/7.4/cli/conf.d/20-json.ini

    - /etc/php/7.4/cli/conf.d/20-phar.ini

    - /etc/php/7.4/cli/conf.d/20-posix.ini

    - /etc/php/7.4/cli/conf.d/20-readline.ini

    - /etc/php/7.4/cli/conf.d/20-shmop.ini

    - /etc/php/7.4/cli/conf.d/20-simplexml.ini

    - /etc/php/7.4/cli/conf.d/20-sockets.ini

    - /etc/php/7.4/cli/conf.d/20-sysvmsg.ini

    - /etc/php/7.4/cli/conf.d/20-sysvsem.ini

    - /etc/php/7.4/cli/conf.d/20-sysvshm.ini

    - /etc/php/7.4/cli/conf.d/20-tokenizer.ini

    - /etc/php/7.4/cli/conf.d/20-xmlreader.ini

    - /etc/php/7.4/cli/conf.d/20-xmlwriter.ini

    - /etc/php/7.4/cli/conf.d/20-xsl.ini

  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

Solution: 

Step 1: sudo apt-get install -y php7.2-gd

Step 2: sudo apt-get install php7.2-intl

Step 3: sudo apt-get install php7.2-xsl

Step 4: sudo apt-get install php7.2-mbstring

Rerun the below command, the problem will be resolved:

composer create-project drupal/recommended-project ./drupal