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Browse all Linuxize tutorials, guides, and references.
SSH Permission Denied (publickey): Causes and Fixes
How to troubleshoot the SSH "Permission denied (publickey)" error in Linux. Covers file permissions, missing keys, SELinux, SSH agent issues, and server-side debugging.
Install and Configure Roundcube Webmail on Ubuntu 26.04
Install Roundcube Webmail on Ubuntu 26.04 with PHP-FPM, MySQL, Nginx, IMAP, SMTP submission, and server-side Sieve filters.
Install and Integrate Rspamd on Ubuntu 26.04
Install Rspamd on Ubuntu 26.04, connect it to Postfix as a milter, configure Redis, and publish DKIM and DMARC records for your mail domain.
Install and Configure Postfix and Dovecot on Ubuntu 26.04
Postfix is an open-source mail transfer agent (MTA), a service used to send and receive emails. Dovecot is an IMAP/POP3 server and in our setup it will also handle local delivery and user authentication.
Set up PostfixAdmin on Ubuntu 26.04
Set up PostfixAdmin on Ubuntu 26.04 with Nginx, PHP, MySQL, DNS records, and a Let's Encrypt certificate for a virtual mail server.
How to Use SFTP Command to Transfer Files
Use the sftp command to connect over SSH, upload and download files, transfer directories, run batch jobs, and troubleshoot common errors.
How to Install Python on Ubuntu 26.04
Install Python on Ubuntu 26.04 using the default Ubuntu packages, the deadsnakes PPA for alternate versions, or a source build. Includes pip and virtual environments.
fdisk Command in Linux: Create Disk Partitions
Use the fdisk command in Linux to list disks, create GPT or MBR partitions, change partition types, format new partitions, and mount them safely.
How to Install Python on Ubuntu 24.04
Install Python on Ubuntu 24.04 using the default Ubuntu packages, the deadsnakes PPA for newer versions, or a source build. Includes pip and virtual environments.
ps Command in Linux: ps aux and Common Options
Use ps aux and related ps command options in Linux to list running processes, read output columns, sort by CPU or memory, filter by PID or user, and show full command lines.
How to Remove a User in Linux
Remove user accounts in Linux with userdel. This guide explains how to delete a user, remove the home directory, handle logged-in users, clean up cron jobs, and find files left behind.
How to Extract tar.xz Files in Linux
Extract .tar.xz and .txz archives in Linux with tar. This guide shows the basic command, verbose extraction, extracting to a directory, listing contents, and fixing common tar.xz errors.
SSH Hardening Guide: Best Practices for Linux Servers
SSH hardening best practices for Linux servers, including sshd_config checks, key-only logins, root login restrictions, firewall rules, timeouts, and Fail2Ban.
Bash Split String: Split a String by Delimiter
How to split a string in Bash by a delimiter using read, IFS, tr, awk, and parameter expansion, with practical examples for scripts.
How to Install Docker on Debian 13 (Trixie)
Install Docker on Debian 13 from the official Docker repo. Set up the apt keyring, install Engine and Compose plugin, and fix common errors.
Shebang Explained: #! in Bash and Shell Scripts
What the shebang line does, why scripts need #!, common shebang examples, and when to use #!/bin/bash or #!/usr/bin/env bash.
How to Add a User to a Group in Linux
Add users to Linux groups with usermod, verify group membership, change primary groups, and fix common issues when group changes do not apply.
Install deb Files on Ubuntu: apt, dpkg, and gdebi
Install local .deb files on Ubuntu with apt, dpkg, or gdebi. Fix dependency errors, inspect packages, install via GUI, and remove them safely.
mv Command in Linux: Move Files and Directories
Move and rename files and directories in Linux with the mv command. This guide covers single files, directories, multiple files, overwrite prompts, backups, and cross-filesystem moves.
How to Save a File and Exit Vim
Save a file and quit Vim or Vi with :w, :wq, :q!, :x, ZZ, and ZQ. This guide explains the common save, exit, discard, and read-only file commands.
