Python-application .desktop-shortcut Causing Malfunction

I wanted to create a desktop launcher for my Python application. The application executes various ssh operations over pexpect with publickey-authentication. The problem is however,

Solution 1:

As Mirosław Zalewski suspected in the comments, the problem was the ssh-agent was not running for the desktop-environment because ssh-add was initially used in the /etc/sources. Executing ssh-add in the X-users ~./profile therefore solves the problem.