Still impacts 4.18.4-1, although perhaps the bug should be against something gio related, or even tasksel or debian-installer?
I ran into this when running through the Debian Installer and selecting XFCE as part of tasksel. Perhaps that task should bring in gvfs-backends? "Failed to browse the network" comes from https://gitlab.xfce.org/xfce/thunar/-/blob/master/thunar/thunar-window.c?ref_type=heads#L4731 but the "Location not supported" doesn't seem to be in that codebase. Thanks, Adam