Невозможно использовать компилятор g ++

Я попытался сделать это:

$ g++
The program 'g++' is currently not installed. You can install it by typing:
sudo apt-get install g++
$ sudo apt-get install g++
[sudo] password for user: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
g++ is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.