Another Debian bug reference ( #1002725) provided a better (for me!)
clue:
In /etc/apparmor.d/usr.bin.evince
adding after
/usr/bin/pcmanfm Cx -> sanitized_helper, # LXDE
/usr/bin/krusader Cx -> sanitized_helper, # KDE
/usr/bin/thunar Cx -> sanitized_helper, # XFCE
the line
There is a Debian fix,
https://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg1870625.html
Apparently the problem occurs under Cinnamon, but not under Gnome-
Desktop
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