Why “Username is Not in the Sudoers File” Error Occurs?

Why “Username is Not in the Sudoers File” Error Occurs?

User not added to the sudoers file: The sudoers file, located at /etc/sudoers, specifies which users or groups are granted sudo privileges. If a user is not listed in this file or is not a member of a group with sudo permissions, attempts to use sudo will result in the error. Syntax errors in the sudoers file: Mistakes in the syntax of the sudoers file can lead to parsing errors, causing the system to reject the file. These errors may include typos, incorrect formatting, or missing entries. Editing the sudoers file with incorrect tools: Modifying the sudoers file requires specific tools visudo to ensure proper syntax checking and avoid corruption. Editing the file directly with other text editors may introduce errors and trigger the mentioned error. File permissions: Incorrect permissions on the sudoers file itself can prevent users from accessing or modifying it. The file should be readable and writable only by the root user to maintain security....

How to Fix “Username is Not in the Sudoers File”?

In the Linux Distribution, there are two methods to solve this error. So we will look at each method in step by step approach....

Conclusion

In conclusion, resolving the “Username is Not in the Sudoers File” error on Linux is crucial for restoring administrative privileges. This error can result from various issues, including user exclusion, syntax errors, or incorrect file permissions. The provided solutions—modifying the sudoers file in /etc/sudoers.d or adding the user to the sudo group using usermod—offer effective ways to address the problem. Understanding the root causes and implementing the appropriate method ensures a secure and efficient system management experience, allowing users to choose the solution that best fits their Linux distribution....