Thanks for sharing your experience. I took a look at my .local/share and saw shotwell/wallpaper/ and the XML. I did not have .local/share/gnome-background-properties either. However, if I copied the XML to gnome-background-properties, it did not work for me.
I've tried to install Ubuntu 22.04 beta in a virtual machine and the slideshow seems to work fine. I guess maybe this is a bug that only appears when "apt upgrade". If that is the case, I think eventually no one will fix the issue for me as any Ubuntu developer can mark the bug something like "can't reproduce".
Thanks for sharing your experience. I took a look at my .local/share and saw shotwell/wallpaper/ and the XML. I did not have .local/ share/gnome- background- properties either. However, if I copied the XML to gnome-backgroun d-properties, it did not work for me.
I've tried to install Ubuntu 22.04 beta in a virtual machine and the slideshow seems to work fine. I guess maybe this is a bug that only appears when "apt upgrade". If that is the case, I think eventually no one will fix the issue for me as any Ubuntu developer can mark the bug something like "can't reproduce".