Terminal is unable to find websploit while I have installed it

I have installed websploit on Ubuntu, but found a failed message in the installation acknowledgement.

Welcome To Websploit Framework Install Script
Installing ...
**ln: failed to create symbolic link '/usr/bin/websploit': File exists**
Installed Directory : /usr/share/websploit
Run From Terminal : sudo websploit
Installation Complete.

After this I ran cd websploit and then websploit but got this message.

ubuntu@ubuntu:~/websploit$ websploit
/usr/bin/env: ‘python’: No such file or directory