$ sudo apt-get update
$ sudo apt-get install imageshack-uploader 

imageshack-uploader is installed in your system.

Make ensure the imageshack-uploader package were installed using the commands given below,

$ sudo dpkg-query -l | grep imageshack-uploader *

You will get with imageshack-uploader package name, version, architecture and description in a table

imageshack-uploader package basic information: