All right. It actually works with gvfs-backends package installed, but
it refuses to download images using HTTPS. I have to use plain HTTP to
download the image.
But then again, not having gvfs-backends installed by default adds an
extra step to having GIMP working with all features.
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You
Public bug reported:
Kubuntu does not ship with GIMP.
GIMP package has gvfs-backends as a suggestion:
Suggests: gimp-help-en | gimp-help, gimp-data-extras, gvfs-backends, libasound2
gvfs-backends is needed for the «Open Location» functionality.
I installed that package and rebooted the