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Keeping your VPS updated is one of the most important and simplest maintenance tasks — it applies security patches, fixes bugs, and keeps installed software current. This guide covers the standard APT-based update process for both Ubuntu and Debian.

Prerequisites

• Ubuntu or Debian VPS
• Root or sudo access

Step 1 — Check Your Current Version

cat /etc/os-release

Step 2 — Refresh the Package List

sudo apt update

This retrieves the latest package information from your configured repositories — it does not install anything yet.

Step 3 — See What Will Be Updated

apt list --upgradable

Step 4 — Install Available Updates

sudo apt upgrade -y

Step 5 — Perform a Full Upgrade (When Needed)

Some updates require installing or removing dependent packages. Use full-upgrade when apt upgrade reports held-back packages:

sudo apt full-upgrade -y

On production servers, review the proposed package changes before confirming.

Step 6 — Remove Unused Packages

sudo apt autoremove -y
sudo apt autoclean

Step 7 — Check If a Reboot Is Required

test -f /var/run/reboot-required && echo "Reboot required" || echo "No reboot required"

Step 8 — Reboot Safely

sudo reboot

Your SSH session will close. Wait a minute, then reconnect.

Verifying Services After a Reboot

sudo systemctl --failed

This lists any services that failed to start — investigate and restart them if needed.

Common Errors

Package repository error — check your internet connection and confirm the repository entries in /etc/apt/sources.list are correct for your distribution version.

Broken packages:

sudo apt --fix-broken install

dpkg was interrupted:

sudo dpkg --configure -a

Best Practices for Production Servers

• Take a snapshot or backup before major upgrades
• Apply security-only patches automatically (see Automatic Security Updates), and review feature upgrades manually
• Schedule reboots during a maintenance window
• Verify critical services after every reboot

FAQ

How often should I update?
Check for security updates weekly at minimum; automatic security updates are recommended for continuous protection between manual reviews.

Does apt update install anything?
No — it only refreshes the package index. You must run apt upgrade to actually install updates.

Related Articles

• How to Enable Automatic Security Updates on Ubuntu & Debian
• VPS Security Checklist for Beginners
• How to Reboot a Linux VPS Safely