Today, the Debain server version is installed on the old computer. The installation process is normal, but after entering the system, the software update cannot be performed, and an error message such as "Permission denied" will be obtained.

For most Linux systems, we can get root privileges through the "sudo" command, or log in to the super administrator account via "su" to perform various operations that require root privileges.

However, Debain does not have sudo installed at all (at least I did not install this version). The main content of this article is "How to install sudo and configure sudoers files".

# Installation

1. Log in to the root account, type su and enter the root password to enter the root account.

2. Use the command apt-get install sudo to install sudo.

# Configuration

1. Use the command adduser leo sudo to add your normal account to the sudo group.

2. Enter /etc/sudoers The file is located at %sudo ALL = (ALL:ALL) ALL by adding leo ALL = (ALL :ALL) ALL where leo is replaced with your login username, save and exit.

as the picture shows:

# Verify

Restart the terminal and enter the command *sudo ls * as shown in the figure below, indicating success.

Otherwise, check the installation and configuration steps.