Comment 2 for bug 1492767

I also get this error while running update command 'sudo apt-get update && sudo apt-get upgrade' after fresh installation of
 Ubuntu 14.04.3.

=============== Error Log ==========================

(gtk-update-icon-cache-3.0:5815): GdkPixbuf-WARNING **: Cannot open pixbuf loader module file '/usr/lib/x86_64-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/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache
to make things work again for the time being.

========================================================

So as instructed in log , i ran
'sudo gdk-pixbuf-query-loaders > /usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache '
after that when i restarted my laptop, i got no top-bar on login screen , no wallpaper, and also occurred problem in opening desktop. It shows blue screen then put me again on login screen.

To resolve this problem i have to reinstall unity desktop.

Waiting to fix this issue.