Gtk-Message: Failed to load module "unity-gtk-module" Ubuntu 14.04

Question

I installed Ubuntu 14.04 recently on my computer. After I followed this link to install Adobe pdf reader, ever time I use xdg-open to open a pdf file, there are tons of message showing on my screen:

(acroread: 31045): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

There are also two lines of messages:

Gtk-Message: Failed to load module "overlay-scrollbar"

Gtk-Message: Failed t0 load module "unity-gtk-module"

I tried this link and this link. And I tried the bash command

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/

following this link. None of them work. The pdf files cold be opened, but these tons of warnings are annoying. could anyone tell me how to eliminate these messages?

Thanks!

Solution

To get rid of the "murrine" messages, the following worked for me:

sudo apt-get install --reinstall gtk2-engines-murrine:i386

The other two messages seem more complicated to remove manually, and at least the first one is due to a bug - see How do I install 32-bit libraries when they keep having uninstallable dependencies? and bug report at https://bugs.launchpad.net/ubuntu/+source/overlay-scrollbar/+bug/1134202 .