Update, Upgrade and Clean a Debian-based Linux system at boot

To automatically update, upgrade and clean a Debian-based Linux system at boot, you can create a systemd service file with the following steps:

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1. Open a terminal and switch to the root user by running the command sudo su.
2. Create a new systemd service file by running the command nano /etc/systemd/system/update-debian.service.
3. In the nano text editor, add the following lines to the service file:

[Unit] Description=Update Debian at boot After=network-online.target
 [Service]
ExecStart=/usr/bin/apt update && /usr/bin/apt upgrade -y && /usr/bin/apt autoremove -y && /usr/bin/apt autoclean -y
 [Install]
WantedBy=multi-user.target

4. Save the file and exit the editor by pressing Ctrl+X, then Y, then Enter.
5. Reload the systemd daemon by running the command systemctl daemon-reload.
6. Enable the new service to run at boot by running the command systemctl enable update-debian.service.

Now, whenever the system boots up, the update-debian service will automatically update, upgrade, and clean up the system using the apt package manager.

Note: Make sure that the system is connected to the internet at boot time to ensure that the updates can be downloaded and installed successfully.