I have recently installed ubuntu 14.04 . I tried to run a c++ code by a command like this:

g++ first.cpp -o first

Then it said:

The program 'g++' is currently not installed. You can install it by typing:

sudo apt-get install g++

And then I did. After typing it and pressing enter it showed a message like this:

gedit is already the newest version.

libgrail6 is already the newest version.

xserver-xorg-core is already the newest version.

libgdata13 is already the newest version

...

(and many more lines like this)

Then I tried to run the same command given above again. But the terminal said again that I don't have g++ installed. What am I missing here? How to run the C++ code now?