It is not normal.
Original bug-report was written against apport.
I started to call xdg-open and gvfs-open directly to analyze the problem.
Apport uses xdg-open (which calls gvfs-open) in /usr/lib/python3/dist-packages/apport/ui.py .
So apport uses deprecated mechanism. It is not critical. But in 16.04 LTS I do not have such message.
It is not normal.
Original bug-report was written against apport.
I started to call xdg-open and gvfs-open directly to analyze the problem.
Apport uses xdg-open (which calls gvfs-open) in /usr/lib/ python3/ dist-packages/ apport/ ui.py .
So apport uses deprecated mechanism. It is not critical. But in 16.04 LTS I do not have such message.