cd /var/www/html/<magento install directory>
find var generated vendor pub/static pub/media app/etc -type f -exec chmod g+w {} +
find var generated vendor pub/static pub/media app/etc -type d -exec chmod g+ws {} +
chown -R :www-data . # Ubuntu
chmod u+x bin/magento
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy -f
php bin/magento indexer:reindex
php bin/magento c:f

find . -type f -exec chmod 664 {} \;
find . -type d -exec chmod 775 {} \;
find var pub/static pub/media generated/ app/etc -type f -exec chmod g+w {} \;
find var pub/static pub/media generated/ app/etc -type d -exec chmod g+ws {} \;