$ sudo apt-get update
$ sudo apt-get install libdeclarative-sensors 

libdeclarative-sensors is installed in your system.

Make ensure the libdeclarative-sensors package were installed using the commands given below,

$ sudo dpkg-query -l | grep libdeclarative-sensors *

You will get with libdeclarative-sensors package name, version, architecture and description in a table

libdeclarative-sensors package basic information: