$ sudo apt-get update
$ sudo apt-get install libsublime7 

libsublime7 is installed in your system.

Make ensure the libsublime7 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libsublime7 *

You will get with libsublime7 package name, version, architecture and description in a table

libsublime7 package basic information: