Composer: Cannot create cache directory /home/webadmin/.composer/cache/repo/https-

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When working with Drupal 8 and Ubuntu 18.04, you might encounter this Error: Cannot create cache directory /home/webadmin/.composer/cache/repo/https---packagist.org/, or directory is not writable. Proceeding without cache

Solution: sudo chown -R $USER $HOME/.composer

Composer: Cannot create cache directory /home/webadmin/.composer/cache/repo/https-

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