/usr/bin/env: Bad Interpreter

If you've corrupted or deleted your /usr/bin/env file, you'll most certainly brake a lot of your installed packages. You'll probably see errors like:

/usr/bin/env: bad interpreter: No such file or directory

The way to fix this issue is to reinstall coreutils:

        sudo aptitude reinstall coreutils


Don't have aptitude? Just install it:

       sudo apt-get install aptitude