Contents of my sources.list.d include
deb http://apt.syncthing.net/ syncthing release
Not sure how you place this, but it looks official to me.
No ACL or magic, just a filesystem. As to networking, its a samba share, with no weird authentication, linux usernames.
So is there no way, after renaming the tmp file, for it to re-assume ownership?
The issue I was trying to avoid, was having 10 instances of syncthing - it seems like one instance consumes a huge resource, most of it with the GUI. Unless you can point me at a better way to configure ?