It has been there for a while under Virtualmin, but I was hesitating on using the GUI configuration of Let's Encrypt from Virtualmin on an existing manual configuration. Let's Encrypt does not allow you to make any change afterwards, yielding this error :
Request failed : The native Let's Encrypt client was used previously on this system, and must be used for all future certificate requests.
The default Drupal 8 .htaccess provides +FollowSymLinks.
There is an old discussion about that on the Virtualmin forum.
A patch is under creation for Drupal 8. It changes the
Options +FollowSymLinkson the root .htaccess directory.
You should also change this on the sites/default/files .htaccess