Never mind about the Software Updater log file. I took a picture of it.
In two Trisquel 7 installations on desktops with Intel D865GLC motherboards, the message is:
> Try running the command> gdk-pixbuf-query-loaders > /usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache
> to make things work again for the time being.This did not happen in a dual-boot MicroCenter PowerSpec desktop running Ubuntu/Trisquel 7.
