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=== PHP - Ubuntu - ext-dom - the requested PHP extension dom is missing from your system ===

После выполнения:
 # composer install

получаем серию ошибок: '''requires ext-dom * -> the requested PHP extension dom is missing from your system.''' :
   Problem 1
    - Installation request for dompdf/dompdf v0.8.3 -> satisfiable by dompdf/dompdf[v0.8.3].
    - dompdf/dompdf v0.8.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  Problem 2
    - Installation request for phar-io/manifest 1.0.3 -> satisfiable by phar-io/manifest[1.0.3].
    - phar-io/manifest 1.0.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  Problem 3
    - Installation request for phpunit/php-code-coverage 6.1.4 -> satisfiable by phpunit/php-code-coverage[6.1.4].
    - phpunit/php-code-coverage 6.1.4 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  Problem 4
    - Installation request for phpunit/phpunit 7.5.16 -> satisfiable by phpunit/phpunit[7.5.16].
    - phpunit/phpunit 7.5.16 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  Problem 5
    - Installation request for theseer/tokenizer 1.1.3 -> satisfiable by theseer/tokenizer[1.1.3].
    - theseer/tokenizer 1.1.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
  Problem 6
    - dompdf/dompdf v0.8.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
    - laravel/cashier v7.2.2 requires dompdf/dompdf ^0.8.0 -> satisfiable by dompdf/dompdf[v0.8.3].
    - Installation request for laravel/cashier v7.2.2 -> satisfiable by laravel/cashier[v7.2.2].


Решение - доустановить модуль для PHP '''php-xml''':
 # apt install php-xml
 # systemctl restart apache2