$ sudo apt-get update
$ sudo apt-get install libldb1-dbg 

libldb1-dbg is installed in your system.

Make ensure the libldb1-dbg package were installed using the commands given below,

$ sudo dpkg-query -l | grep libldb1-dbg *

You will get with libldb1-dbg package name, version, architecture and description in a table

libldb1-dbg package basic information: