Other distributions of Linux may vary slightly from this, but will have the same general steps. This article is specifically for Ubuntu.
If you are using Ubuntu as a desktop, you don’t have to go to the terminal to update the system. You can still use the command line, but it’s optional for you.
In the menu, look for “Software Updater” and run it.
It will check if there are updates available for your system.
If there are updates available, it will give you the option to install the updates.
Click on “Install Now.” It may ask for your password.
Once you enter your password, it will start installing the updates.
In some cases, you may need to reboot your Ubuntu system for the installed updates to work properly. You’ll be notified at the end of the update if you need to restart the system.
You can choose to restart later if you don’t want to reboot your system straightaway.
For more ways and details you can check: https://itsfoss.com/update-ubuntu/