Do what
@KGIII has suggested above,
First.
Then, read what i have pasted below..
The Unattended Upgrades installs security updates automatically in Ubuntu. This guide explains how to disable unattended upgrades on Ubuntu.
ostechnix.com
Disable unattended upgrades on Ubuntu
To disable unattended upgrades on Ubuntu and its derivatives, run:
$ sudo dpkg-reconfigure unattended-upgrades
Choose
No and hit ENTER to disable unattended upgrades.
Disable Unattended Upgrades On Ubuntu
You can also remove it altogether if you don't want it anymore.
$ sudo apt remove unattended-upgrades
It doesn't remove any other software on your Ubuntu system, so it is safe to remove unattended upgrades package.
From now on, your Ubuntu system doesn't automatically download and install important updates. You have to manually download and install updates once in a while by using commands:
$ sudo apt update
$ sudo apt upgrade
The Unattended Upgrades feature is enabled by default and it runs at system boot without user's permission. This might be helpful for casual users who wants to keep their system up-to-date without user-intervention. But for testing systems, It is completely unnecessary, so I disabled it in all my Ubuntu VMs.