Cups 維護筆記

Fixing CUPS Print Server Issue on Ubuntu 24.04

Date: 2025-11-30 12:42 Tags: #Linux #cups #printserver

Table of Contents

• What happened
• How I fixed it
• Prerequisites
• Step-by-step guide

What Happened

• I was running CUPS 2.4.7 on Ubuntu 24.04.
• The client suddenly couldn’t print anything.
• After checking the server, I found that CUPS had shut down unexpectedly.

How I Fixed It

• Logged into Ubuntu
• Checked the CUPS service status
• Restarted the required services
• Tested printing afterward to confirm everything was working again

Prerequisites

• A keyboard
• A monitor
• Your Ubuntu user account and password

Getting Started

If you forgot your root password

You can reset it through GRUB.

 1. edit 'ro' to 'rw'
 rw init=/bin/bash

 1. press Ctrl + X
 1. press Enter to enter root bash

 ls /home \# check your username

 passwd {user}

 exec /sbin/init

Check CUPS Status

Use these commands to find the problem:

systemctl status cups

sudo cupsd -t \# display error information 
sudo cat /var/log/cups/error_log \# check cups log

## `TriggeredBy: cups.socket` and `Dependency failed`

sudo systemctl stop cups.service cups.socket cups.path
sudo systemctl start cups.socket
sudo systemctl start cups.service
sudo systemctl status cups