On my Lubuntu 16.04 I connected to my NAS and was not able to delete files. The error message was something like:
Deletion log file could not be created: No authorization.
My connection to the share is established through:
sudo mount -t cifs -o user=USERSERVER,uid=LOCALUSER,gid=LOCALGROUP,username=USERSERVER,password=PW //192.168.0.102/RAID6 /media/OMV
Because I did not find a lot on the internet about it I wanted to share my solution and keep the german original error message, which is "Löschprotokolldatei konnte nicht angelegt werden".
Somehow, the (hidden) folder
SHARENAME/.Trash-1000
was owned by a different user than the one I used when connecting to the share. As soon as I fixed this on the NAS (over ssh) withsudo chown -R USER:GROUP FOLDER
I was able to delete again from inside my filemanager that was connected to the share.