"PHP extensions Disabled" error on Drupal 8

Error

Screenshot of error

You are trying to install Drupal 8, but during the installation at "Verify requirements" step, Drupal returns the following error message

PHP extensions
Disabled
Drupal requires you to enable the PHP extensions in the following list (see the system requirements page for more information):
gd

⋅ Categories: Drupal 8.x, Programmers, Site administrators, Site builders, PHP extensions, gd, php5-gd, extensions, Intermediate, No known problems

"PHP extensions Disabled" error on Drupal 7

Error

You are trying to install Drupal 7, but during the installation at "Verify requirements" step, Drupal returns the following error message

PHP extensions Disabled Drupal requires you to enable the PHP extensions in the following list (see the system requirements page for more information): gd

⋅ Categories: Drupal 7.x, Designers/themers, Programmers, Site administrators, Site builders, PHP extensions, gd, php7.0-gd, php5-gd, extensions, Beginner, No known problems
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