https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-owncloud-on-ubuntu-16-04


https는 letsencrypt로 해결



오류시 apache error log 확인

apt install php-json php-pdo php-bz2 php-curl php-gd php-imagick php-intl php-mbstring php-xml php-zip