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