$ sudo apt-get update
$ sudo apt-get install opendnssec-signer 

opendnssec-signer is installed in your system.

Make ensure the opendnssec-signer package were installed using the commands given below,

$ sudo dpkg-query -l | grep opendnssec-signer *

You will get with opendnssec-signer package name, version, architecture and description in a table

opendnssec-signer package basic information: