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Linux & Unix

How to eject CD/DVD tray from command line on Linux

If you're new to the Linux command line, you may have heard that it's one of the most powerful features…

How to Fix OneDrive Error Code 0x80070185 on Windows 11

OneDrive is a widely-used cloud storage service that comes integrated with Windows, providing seamless file synchronization across devices. However, like…

How to access a name based website without a DNS record

The /etc/hosts file on a Linux system is a critical configuration file that maps hostnames to IP addresses. This file…

What is apt-proxy and how to install it on Ubuntu 24.04

Apt Proxy on Ubuntu is a powerful tool, particularly useful in environments where multiple machines require frequent software updates or…

How to Resize a Linux VMWare disk

To enlarge a disk in a VMware Linux virtual machine, you'll need to follow a multi-step process. This involves both…

How to reset the administrator password in ISPConfig 3

Since ISPConfig 3.2.12, the password can be reset using ispc command: Reset the password of the admin user. The command…

How to enable postfix service to start at boot on Linux

To start Postfix service at boot on a Linux system using the systemctl command, you can use the following steps.…

How to parse a .env file with PHP

Parsing a .env (dotenv) file in PHP can be done by using a dedicated library or writing a simple custom…

How to create a custom invoice template in ISPConfig 3 Billing Module

This tutorial shows how you can build your own custom template for the PDF invoices in the ISPConfig billing module.…

[SOLVED] The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key

Here is the solution if you've got the following error message when updating package lists on Debian (apt-get update): The…

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