Linux: how to update (L)ubuntu 18.04 from the terminal

Self-tutoring about Ubuntu Linux: the tutor mentions command-line update.

I resurrected a computer that likely hadn’t run in 8 years (or longer) using Lubuntu. It identifies, from the terminal, as Ubuntu 18.04.

I tried updating its software from the GUI but no luck: I decided to try from the terminal. Specifically, I typed in

sudo apt update

then gave the password. After it finished finding the updates, I typed in

sudo apt upgrade

It was a success, though the updates took quite some time to process.

Source:

linuxconfig.org