Omer Cakmak

Install or upgrade Python on Ubuntu 22.04 and 24.04 without replacing system python3: latest stable 3.14, optional 3.15 pre-release, Deadsnakes PPA or source altinstall, virtualenv, safe project migration, and …

Ubuntu is a free and open-source operating system that is widely used in desktops and servers. It is known for its stability, security, and ease of use. One

In this tutorial we will share steps and different methods to install EPE repo in Rocky Linux

Install NordVPN on Ubuntu with the official install.sh script or Snap, add your user to the nordvpn group, log in with nordvpn login, connect with nordvpn connect, and fix Permission denied nordvpnd.sock and LAN …

Remove unused packages on Ubuntu with apt autoremove for orphaned dependencies, apt clean and autoclean for download cache, purge rc config leftovers, protect apps with apt-mark manual, and prune old Snap …

Install Wireshark on Ubuntu with sudo apt install wireshark from universe, allow non-root capture via wireshark-common debconf, add your user to the wireshark group, and optionally install tshark for CLI-only capture on …

List obsolete packages on Ubuntu with apt list ?obsolete, preview removal with apt-get -s, purge safely after do-release-upgrade, and distinguish obsolete packages from autoremove and rc config cleanup.

Install Slack on Ubuntu with Slack Packagecloud APT repo, official slack-desktop .deb from slack.com, or sudo snap install slack. Launch with slack, update per method, and remove only one desktop package at a time.

Install Rscript on Ubuntu with sudo apt install r-base from universe, optionally add the CRAN apt repository on supported LTS releases, verify with Rscript --version, run example.R from the shell or cron, and uninstall …

List installed packages on Ubuntu with apt list --installed, dpkg -l, snap list, and apt-mark showmanual. Search one package, count totals, export a list for another machine, and check upgradable packages.

Install Flask on Ubuntu inside a Python virtual environment with pip (recommended), or from the python3-flask apt package, verify with python -m flask --version, run a Hello World app with flask run, and uninstall per …

Install Plex Media Server on Ubuntu from the official repo.plex.tv APT repository or a .deb download, start plexmediaserver with systemctl, open port 32400, complete setup at http://127.0.0.1:32400/web, and fix plex user …

Install MongoDB 8.0 Community on Ubuntu from the official mongodb-org repo with gpg keyring (jammy/noble/focal), start mongod with systemctl, connect with mongosh, install shell-only for Atlas, and fix libssl1.1, AVX, …

Install Terminator on Ubuntu with sudo apt install terminator from universe (2.1.4 on 25.04), verify with which terminator and dpkg, set the default x-terminal-emulator, split panes with Ctrl+Shift+O/E, and fix DISPLAY …

Install OpenCV on Ubuntu with sudo apt install libopencv-dev python3-opencv (4.10.0 on 25.04), verify with import cv2 and pkg-config opencv4, use pip opencv-python in a venv for newer wheels, or build from source when …

Install Minecraft Java Edition on Ubuntu from the official Minecraft.deb (launcher 2.1.3), openjdk-21-jre-headless, or the Minecraft.tar.gz binary: sign in with a Microsoft account, launch minecraft-launcher, and …

Install Apache Maven on Ubuntu with openjdk-17-jdk or default-jdk, then sudo apt install maven (3.9.9 on 25.04): set JAVA_HOME, verify with mvn -version, install 3.9.16 from the official tarball when apt lags upstream, …

Remove Python 3.14 or 3.15 on Ubuntu 22.04 and 24.04 safely: uninstall Deadsnakes packages, delete source altinstall files, clean pyenv versions and venvs, and keep Ubuntu system python3 working.

Linux rm has no built-in undo and does not use Trash by default, but you can sometimes recover deleted files—stop writes to the disk first, then try backups, open file handles via /proc, carving tools like Foremost and …

Learn how to install fonts in Linux using the command line and GUI. Install TTF and OTF fonts for the current user or system-wide, update font cache, verify with fc-list, and uninstall fonts.

Learn how to use a pip requirements.txt file to install Python dependencies with pip install -r, create the file manually or with pip freeze, add version constraints, and fix common errors.

What echo does on Linux, the echo -n flag (no trailing newline), why echo n is not echo -n, how echo -e handles backslash escapes like \n, and when to use printf instead.

Bash counter patterns: C-style for loop counter, bash while loop counter, increment with (( )) and let, bash for count over a list, and a small script counter over files—plus links to deeper increment and loop guides.

Bash trap Ctrl+C (SIGINT): linux ctrl c signal basics, trap INT and trap ctrl-c patterns, ignore with trap empty string, EXIT cleanup, quoting pitfalls, and subshell vs child-process behavior.

Learn how to change username in Linux with usermod, rename the home directory, update the primary group, verify UID/GID ownership, and fix common username rename errors safely.

Learn how to set SFTP umask in Linux with OpenSSH internal-sftp, sftp-server, Match User, Match Group, chrooted SFTP users, and tested upload permission examples. Also understand Linux umask, why .bashrc umask does not …

Learn how to backup and restore Brave Browser profile data on Linux, including settings, bookmarks, session files, cache, profile paths, tar archives, checksums, and safe restore steps.

Learn how to install a specific package version with apt or apt-get on Ubuntu and Debian, list available versions, simulate installs safely, handle dependency conflicts, and hold or unhold package versions.

Learn how to add a Linux user to the sudo group on Ubuntu and Debian, use the wheel group on RHEL-based systems, verify sudo access, and avoid confusing group-based sudo with custom sudoers file rules.

Learn how to list groups in Linux and check user group membership using commands like groups, id, getent, compgen, and /etc/group. This guide explains how to view all groups, list groups for a user, and display users …