Further comments in bug #728700 led me to searching Google. It appears that LightDM may be a red herring for this problem.
It seems to be (as far as I can tell — I may be wrong) that this is caused by glib when cancelling a file being copied, as per comment #60 and others. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/984785 Title: .goutputstream files polluting $HOME To manage notifications about this bug go to: https://bugs.launchpad.net/glib/+bug/984785/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs