Install XScreenSaver and remove Gnome default
sudo apt remove gnome-screensaver
sudo apt install xscreensaver xscreensaver-gl xscreensaver-gl-extra
Run the Screensaver UI and configure
In the “Advanced” section enter your Flickr RSS URL in “Choose Random Image”
https://api.flickr.com/services/feeds/photos_faves.gne?id=YOURFLICKRUSERID #replace with your Flickr User ID
Create a systemd user service to autostart
mkdir -p ~/.config/systemd/user/
vim ~/.config/systemd/user/xscreensaver.service
Past the following
[Unit]
Description=XScreenSaver
[Service]
ExecStart=/usr/bin/xscreensaver -nosplash
[Install]
WantedBy=default.target
Start and enable systemd user service
systemctl --user enable xscreensaver
systemctl --user start xscreensaver
To copy the settings (including RSS URL) onto other PC’s or re-install it might be a good idea to backup or copy the contents of ~/.xscreensaver
Leo Gaggl on Google+