And you go through it

sudo apt-get install g++

It shows that you have installed the latest version of G + +, but you just can’t use G + +++

In fact, I accidentally deleted the G + + script file under/usr/bin, leaving a bunch of G + + 7.4, G + + 4.8, etc. enter the command line:

cd /usr/bin
sudo ln -s g++-7.4 g++

That’s all

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