Ubuntu Terminal: "apt-get" invalid syntax

I have just recently installed Ubuntu onto my new laptop, following all steps correctly during installation, installing new applications and drivers from online. Upon finishing installing Ubuntu, I attepmted to install MariaDB via the terminal by typing:

sudo apt-get install software-properties-common

and then the following error is returned:

sudo apt-get install software-propterties-common
  File "<stdin>", line 1
    sudo apt-get install software-propterties-common
           ^
SyntaxError: invalid syntax

How can i get my termianl to function correctly?

You are running the command in a Python interpreter. The command is supposed to be run in a shell. If you are still at the Python interpreter, use Ctrl+D or type exit() to quit the interpreter and return to the shell, or Press Ctrl+Alt+T to open a new terminal. Execute the command there.