$ sudo apt-get update
$ sudo apt-get install libgnutls-openssl27 

libgnutls-openssl27 is installed in your system.

Make ensure the libgnutls-openssl27 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libgnutls-openssl27 *

You will get with libgnutls-openssl27 package name, version, architecture and description in a table

libgnutls-openssl27 package basic information: