I recently updated my Nextcloud installation to the 14.01 release.
After the update, the system’s integrity was compromised : a file was missing !
More precisely, the file
vendor/ezyang/htmlpurifier/maintenance/.htaccess was missing.
A minute google query lead me to the project’s repo where I found the incriminated file.
A quick run of sha512sum on the file confirmed it was the right file.
All that was left to do was to copy the file to right place on my server (ie in the folder