https://www.jurisic.org/index.php?category/Debian/My-Repository

Debian8

echo "deb http://apt.jurisic.org/debian/ jessie main contrib non-free" >> /etc/apt/sources.list.d/jurisic.list 
wget -q http://apt.jurisic.org/Release.key -O- | apt-key add -
apt-get update && apt-get upgrade
apt-get install nextcloud-server -y

/etc/init.d/mysql stop
systemctl disable mysql