I have the same issue, on Ubuntu 17.10. I solved it by moving the download-to directory to home. My "Desktop" is a symlink to DropBox/Desktop, which is a DropBox, with that may entail.
In summary - my suspicion is that it is DropBox to blame. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/700214 Title: File went missing as soon as download completed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/transmission/+bug/700214/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs