Installing updates via Terminal
The commands are as follows:
apt update: Update is used to resynchronize the package index files from their sources on Ubuntu Linux via the Internet.
apt upgrade: Upgrade is used to install the newest versions of all packages currently installed on the Ubuntu system.
To update software list for Ubuntu
First, open the Terminal application and type following two commands (Application > Accessories > Terminal or CTL-ALT-T).
Type the following apt command:
sudo apt update
Install updates and patches on Ubuntu
sudo apt upgrade
ExacqVisions Official stance on Operating System Updates Https://support.exacq.com/#/knowledge-base/article/5144