Omer Cakmak

Install Caddy on Ubuntu 26.04 or 24.04 from the official APT repository, verify caddy.service, serve a static site with a Caddyfile, open UFW ports 80 and 443, and enable automatic HTTPS for a public domain or localhost.

Install CMake on Ubuntu 26.04, 24.04, or 22.04 with apt, Kitware's repository, Snap, or official binaries, and verify which CMake version your project needs with cmake --version and a minimal C++ build.

Install ClamAV on Ubuntu 26.04, 24.04, and 22.04, keep malware signatures current with FreshClam, verify detection with the EICAR test file, and choose clamscan or clamdscan for on-demand scans.

Install Boost C++ on Ubuntu 22.04, 24.04, or 26.04 with libboost-dev, libboost-all-dev, or component packages from apt, or build Boost 1.92 from archives.boost.io, verify with a compile test, and link with g++ or CMake …

Install chkrootkit on Ubuntu 26.04, 24.04, and 22.04 from Universe, run rootkit scans with chkrootkit -q, read INFECTED and PACKET SNIFFER output safely, enable daily scans (systemd timer or packaged cron), and optional …

Install AWS CLI v2 on Ubuntu 26.04, 24.04, and 22.04 using the official AWS installer, ZIP, Snap, or Ubuntu APT. Compare release-specific package availability, verify aws --version, authenticate securely, update, and fix …

Ubuntu volume too low? Learn how to increase sound above 100% on Ubuntu 26.04 and 24.04 using Over-Amplification or the PipeWire wpctl command.

Update Flameshot on Ubuntu 26.04 and 24.04 from APT, see why apt upgrade stops at 13.3 or 12.1, and move to Flameshot 14 with Flatpak or the latest AppImage without mixing release repositories.

Install PhotoQt on Ubuntu 26.04, 24.04, or 22.04 with APT, Flatpak, Snap, or the PhotoQt PPA. Includes version checks, launch, update, and removal.

Uninstall software on Ubuntu 26.04 by matching the install method—apt remove or purge for Deb packages, snap remove, flatpak uninstall, App Center Manage, and safe autoremove simulation before you confirm dependency …

Install HPLIP on Ubuntu 26.04 and 24.04 with apt first, check your printer minimum HPLIP version against Ubuntu packages, use hp-setup and hp-plugin when needed, and only consider HP SourceForge .run when upstream …

Install the Google Dart programming language SDK on Ubuntu 26.04 and 24.04 from the official APT repository, verify with dart --version, run Hello World, upgrade through apt, and know when Flutter already includes Dart.

Ubuntu does not ship Windows-style real-time antivirus. Learn when a home desktop can skip AV, when file or mail servers should scan with ClamAV, what AppArmor and updates already provide on Ubuntu 26.04, and where to …

Check whether an x86 CPU supports 2 MB or 1 GB HugePages, find the current HugeTLB default size, and change default_hugepagesz persistently with grubby on RHEL.

Increase or shrink tmpfs on Linux with size=, /etc/fstab, and mount -o remount. Covers /dev/shm, /run, and systemd /run/user limits on RHEL-family systems.

Install dnsmasq on RHEL 10, cache DNS on loopback, point upstream resolvers at a dedicated file, persist 127.0.0.1 through NetworkManager, and verify cache behavior with dig and tcpdump.

Authorize Samba shares for Active Directory users and groups on a RHEL 10 Winbind member server: valid users, Unix permissions, POSIX ACLs, SELinux, firewall, and Windows access tests.

Authenticate vsftpd FTP logins with Active Directory on RHEL 10 through PAM and SSSD, with deprecation notes, SELinux, passive ports, and tests—prefer SFTP for new deployments.

Let Active Directory users transfer files over SFTP on RHEL 10 after a realmd and SSSD join: sshd, PAM, home directories, optional chroot, and verification from Linux clients.

Join RHEL 10 to Active Directory with Samba Winbind using realm join or net ads join, verify wbinfo and getent, and publish an AD-authenticated Samba share.

Join RHEL 10 or Rocky Linux 10 to Windows Server 2025 Active Directory with realmd, adcli, and SSSD. Discover the domain, run realm join, verify Kerberos, and control AD logins.

Enroll RHEL 10 in Active Directory with adcli join, then configure SSSD, authselect, and NSS yourself—without realm join—for full control of the AD computer account.

Automate password-based SSH and SCP in Linux using sshpass, Expect, and SSH_ASKPASS, with safer password input, host-key handling, and key-based alternatives.

Mount a remote Linux directory over SSH with SSHFS on RHEL, Ubuntu, and Windows. Covers install, user mounts, permissions, fstab, jump hosts, SSHFS-Win UNC paths, and troubleshooting.

Configure OpenSSH host-based authentication on Linux with HostbasedAuthentication, ssh-keysign, shosts.equiv, and verified host keys—plus hostname/DNS checks and safer alternatives.

Test SSH connectivity in Linux step by step: check port 22, verify that sshd responds, test authentication, inspect server-side sshd status, and troubleshoot common SSH errors.

Connect to private Linux servers through an SSH jump or bastion host using ProxyJump, ssh -J, ProxyCommand, and scp -J, with multi-hop routes and troubleshooting examples.

SSH from your host into a Linux VirtualBox VM using NAT port forwarding (recommended), host-only networking, or a bridged adapter — with a mode decision table, guest SSH checks, and troubleshooting for 10.0.2.15 and VPN …

Use OpenSSH host certificates so clients trust one host CA through @cert-authority in known_hosts instead of enrolling every server host key — create a host CA, sign with ssh-keygen -h, configure HostCertificate on sshd, …

Sign files with ssh-keygen -Y sign, verify them with an allowed_signers file, signer identity, namespace, and stdin — no sshd or GPG required on OpenSSH 8.2 and later.