I am using ubuntu 12.04. Every time I start my bash terminal and every time when I finish typing a command(and press enter) , I get this message: 

> 
> ERROR: ld.so: object '/usr/lib/liblunar-calendar-preload.so' from
>  LD\_PRELOAD cannot be preloaded: ignored.
> 
> 
> 

It is weird.
So what is the environment variable LD\_PRELOAD used for? And what is the going on behind the scene?

Thanks.