To install Curl enter the following command in the terminal::
Command:
sudo apt-get update
sudo apt-get install curl
In case the command doesn't works, try with the next commands:
wget http://curl.haxx.se/download/curl-7.49.0.tar.gz tar -xvf curl-7.49.0.tar.gz cd curl-7.49.0/ ./configure
sudo apt-get update
sudo apt install make
make sudo make install