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If I try compiling my C++ source file by the following command:

g++ a.cpp

it outputs:

The program 'g++' can be found in the following packages:
 * g++
 * pentium builder

try:
sudo apt-get intsall <<a>selected package>

However, if I run the suggested command (sudo apt-get install g++), it shows that everything is already installed.

So, basically, how do I compile a simple C++ program in Ubuntu 12.04?

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1  
What is the output of which g++? This sounds like g++ is not in your path. – Chris Betti Dec 6 '12 at 14:16
2  
Did you install build-essential? sudo apt-get install build-essential. – Chris Betti Dec 6 '12 at 14:26

Try this

sudo apt-get update

sudo apt-get install build-essential

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