I would have guessed that Ubuntu would install it by default since its a very common way to get stuff from the internet (when in the terminal), but apparently not (the other option is wget which is most likely installed, but that uses a different way to get the stuff).

You should be able to install curl with sudo apt install curl

That should be easily solved with: sudo apt install curl

curl is a good tool to have in general, you can install it with sudo apt install curl

Wow, interesting. You may be able to install curl to fix that like this:

sudo apt-get update
sudo apt-get install curl

Can't hurt to try

sudo apt install curl

sudo apt install curl

sudo apt install curl