:: if you running thunderbird / firefox and get error like:

/usr/local/firefox/firefox-bin: error while loading shared libraries: libgtk-x11-2.0.so.0: cannot open shared object file: No such file or directory
or
/usr/local/thunderbird/thunderbird: error while loading shared libraries: libgtk-x11-2.0.so.0: cannot open shared object file: No such file or directory

:: how to fix error libgtk-x11 on linux debian / ubuntu

# aptitude install ia32-libs ia32-libs-gtk

:: links
+ google