First, make sure you have the tools you need to be able to compile a C++ code on Ubuntu. For that run the following code in the command line : This line will install all the basic stuff you need for compiling a C++ code, it will install C, C++, and make.

 sudo apt-get install build-essential

Now that you have all you need, I will suggere to explicetely using std::cout / std::endl . That way you don't import all the stuff available under the namespace std that you are not using. Using std::cout / std::endl shows clearly the origin the instance you are using. Notice : you have an error in the main function argument, namely : car, it should be char

#include<iostream>
int main(int argc, char** argv)
{
   std::cout << "hello" << std::endl;
   return 0; 
}

Now you can compile and run your code this way : in this example I'm calling the executable file "hello"

g++ -Wall -o hello aaa.cpp
./hello

You need to install the corresponding package with the headers (normally libc6-dev) with

sudo apt-get install libc6-dev

And for sure install build-essential with

sudo apt-get install build-essential

Then compile your hello.c with the command:

gcc hello.c -o hello

and run it:

./hello