How to reinstall nginx if I deleted /etc/nginx folder (Ubuntu 14.04)?

apt-get --purge remove nginx-*
apt-get install nginx

Try:

sudo aptitude purge nginx && sudo aptitude install nginx

This code will remove and reinstall Nginx

Login as root or:

sudo su -

Then uninstall nginx:

apt-get purge nginx nginx-common nginx-full  

And then install it:

apt-get install nginx

The other way is to run sudo command with -H:

sudo -H apt-get purge nginx nginx-common nginx-full  
sudo -H apt-get install nginx