Comment 8 for bug 1282294

this is still present when upgrading from 14.04 to 14.10.

Processing triggers for hicolor-icon-theme (0.13-1) ...

(gtk-update-icon-cache-3.0:11599): GdkPixbuf-WARNING **: Cannot open pixbuf loader module file '/usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache': No such file or directory

This likely means that your installation is broken.
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.

root@st:~# gdk-pixbuf-query-loaders > /usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache
The program 'gdk-pixbuf-query-loaders' is currently not installed. You can install it by typing:
apt-get install libgdk-pixbuf2.0-dev