20190313 The GNOME background can be set from the desktop with the right mouse button menu. Choose .
Shared background images are often available in
/usr/share/backgrounds/. The default background image for
Ubuntu 18.04 is similarly located within this directory as
REVIEW If you have a collection of background images
~/.local/share/backgrounds then the following command can be used
to randomly choose one to display. This could be put into a cron job
to run each hour!
$ gconftool -t str -s /desktop/gnome/background/picture_filename \ "`find ~/.local/share/backgrounds | random | tail -n 1`"
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