Пробовал копировать php.ini-production file в /etc/php/7.0/cli/php.ini, изменял только значения post_max_size и upload_max_filesize.
sudo systemctl reload php7.0-fpm.service
sudo systemctl reload nginx.service
php -i | grep post_
enable_post_data_reading => On => On
post_max_size => 100M => 100M
php -i | grep upload_max
upload_max_filesize => 96M => 96M
$ cat /etc/php/7.0/fpm/php.ini | grep -e post_ -e filesize
post_max_size = 110M
upload_max_filesize = 100M
Сейчас PHP 7.0.15, был обновлен с 5.6 и Ubuntu 14.04