After a full new install on my Synology (PHP7 and Maria 10 and Apache 2.4) I get an error:
Error index Error: Call to undefined function OC\Settings\Controller\posix_getpwuid()
This has to do with the configuration, but there are no other errors. Security is A+ and I set the additional Apache header.
I have not sen this error on other 13 installs before. This is the first 14 installation I made.