$ sudo apt-get update
$ sudo apt-get install libnautilus-extension1a 

libnautilus-extension1a is installed in your system.

Make ensure the libnautilus-extension1a package were installed using the commands given below,

$ sudo dpkg-query -l | grep libnautilus-extension1a *

You will get with libnautilus-extension1a package name, version, architecture and description in a table

libnautilus-extension1a package basic information: