Hi all. I had the same issue with permissions and Transmission (Debian 9). Automounted cifs share in Gnome Nautilus works perfectly everywhere except Transmission.
Solved this issue by manually mounting with options: sudo mount -t cifs //server/share /mountpath -o user=cifs_user,password=cifs_pw,uid=1000,gid=1000,iocharset=utf8 uid and gid belongs to desktop user you logging in and can be obtained by command: id or cat /etc/passwd -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to transmission in Ubuntu. https://bugs.launchpad.net/bugs/1574934 Title: Error operation not supported Status in transmission package in Ubuntu: Confirmed Bug description: Transmission is unable to save a torrent to a network (SMB/CIFS) share in 16.04. This worked fine in 14.04. The torrent starts to download, but errors out after a few seconds. The error message is Operation not supported (/run/user/1000/gvfs/smb-share:server=nas- 2x3tb.local,share=downloads/ubuntu-16.04-desktop-amd64.iso) Not sure what logs or other information might be needed? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/transmission/+bug/1574934/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

