i started into owncloud with a virtual-appliance-image from owncloud.org.
after a while the users reported some issues with sharing and deleting files.
instead of find and search the problem i've set up a fresh ubuntu 16.04 and installed owncloud using mysql from scratch
everything was fine for like a week, then the same problems started
issue 1: if i delete a file in webinterface i get "Fehler beim löschen der Datei "test.txt" (roughly translated in english - error while deleting the file)
issue 2: if i want to share a folder as a link and try to enable the "allow changes" feature i get a neverending spinning circle
since the problem exists on two totally different systems i think i made a mistake in general at installation or configuration. any ideas?