GNU/Linux

A reliable, step-by-step guide to bring a VirtualBox/VMware .ova into QEMU/KVM, with both GUI and CLI paths—and fixes for the most common pitfalls.Contents Prerequisites 1) Extract the OVA 2) Convert VMDK → QCOW2 3) Create the VM in virt-manager (GUI) 4) Alternative: virt-install (CLI) 5) Common gotchas & fixes Quick troubleshooting checklist Prerequisites QEMU/KVM, libvirt, and virt-manager installed on the host. User is allowed to manage libvirt (typically being in the libvirt/libvirtd and kvm groups). Enough disk space to hold the converted image (QCOW2). 1) Extract the OVA An OVA is a tar archive containing an .ovf (metadata) and one or more .vmdk disks. ...

A simple, repeatable workflow for one VM image (Kali.qcow2), root-owned files, and an SMB share. Overview I run a Kali Linux virtual machine under QEMU/KVM and wanted to use the same VM across three different machines, while keeping a central backup on my NAS. The approach below keeps one master copy on the NAS and uses rsync to push updates from whichever host I used last and pull them on the next host. ...

What started as a quick VirtualBox install turned into a multi‑headed boss fight: USB errors, a sulking kernel driver, a turf war with KVM, and even a Nix syntax bite. Here’s the complete journey and the fixes that finally made my VM boot. Head #1 — USB devices wouldn’t enumerate Can't enumerate USB devices Could not load the Host USB Proxy service: VERR_NOT_FOUND Root cause: Host USB support + Extension Pack missing, and the user not in vboxusers. ...

If you’ve ever felt overwhelmed by NixOS commands, flakes, or the dreaded garbage collection panic, this guide is for you. It’s not just a cheatsheet—it’s a practical survival kit for running NixOS with flakes, keeping your system clean, and always having a rollback strategy when things go sideways. 🖥️ NixOS Essentials Task Command Show version nixos-version Edit config (classic) sudo nano /etc/nixos/configuration.nix Rebuild + switch sudo nixos-rebuild switch Build only (no switch) sudo nixos-rebuild build Roll back last rebuild sudo nixos-rebuild switch --rollback List generations sudo nix-env --list-generations --profile /nix/var/nix/profiles/system ⚡ Flakes Basics Task Command Init flake nix flake init -t templates#nixos Show flake outputs nix flake show Update all inputs nix flake update --commit-lock-file Update one input nix flake lock --update-input nixpkgs --commit-lock-file Build system sudo nixos-rebuild build --flake .#<hostname> Switch system sudo nixos-rebuild switch --flake .#<hostname> Boot (safe) sudo nixos-rebuild boot --flake .#<hostname> 🔄 Safe Updates & Rollbacks Keeping your system updated is great… until it doesn’t boot. Here’s how to avoid disasters. ...

For ages I wanted a clean dual‑boot between Windows 11 (for the few things that require it) and NixOS (for everything I actually enjoy). This is the full journey: GParted wizardry, fixing MBR/GPT issues, laying out a big EFI (because NixOS loves EFI space), and finishing with flakes. Step 1 — Disk Layout in GParted I booted a live USB with GParted and created the following: EFI System Partition (ESP): 1030 MB, FAT32, flags boot, esp Windows: 200 GB, NTFS Linux swap: 8 GB Linux root: rest of the disk (later Btrfs) Why a big ESP? NixOS + systemd‑boot keeps multiple generations of kernels/initrds. A tiny 100 MB ESP fills up fast. ...

Kali is a great learning tool for learning cybersecurity, especially the red-attacking side of it. For the longest time, I had trouble running the Kali VM on my rather old Thinkpad X1 Carbon, as the image consumes quite a few resources. There is a way to use most of Kali’s tools with little resource consumption: ssh into the image via your distro terminal. It turns out it’s quite easy to set this up in VirtualBox, as described in this article: ...

There are a few customisations I have come to love on the personal Debian install. This blog post is meant to describe the steps for my ideal (at this point) Debian 12 post-installation cleanup and provide a few security applications for everyday use and a few programs for light security work. Download and Install Debian 12 Download the DVD version for 64-bit PC architecture from here: https://cdimage.debian.org/debian-cd/current/amd64/iso-dvd/ Installation-wise, I chose to install the Gnome and nothing else: ...

Ingredients: Raspberry pi 4 – I used one with 8Gb of RAM with whatever case is available 1 or 2 external hard disk drives (HDDs) – if 2 are used, a powered USB hub is required, as the pi does not provide enough power for more than 1 HDD of note also, no RAID configurations are possible with external, USB connected HDDs USB microSD card adaptor for installing Raspberry Pi OS raspberry pi power plug cables: USB for HDDs, internet cable with RJ45 plugs Ingredients Step 1: Install Raspberry Pi OS Download the Raspberry Pi imager from https://www.raspberrypi.com/software/ and select the image to be installed on the Pi. ...

After some looking about and being sick of running Windows 10 just for doing some Scratch-like programming for uni, I have decided to update my system to full a Linux pc with, if needed Win10 and Kali VMs for all my HackTheBox and TryHackMe needs. Because I still don’t have proper internet and using phone internet sharing, installing arch without some cable internet is a bit of a stretch. After seeing some Debian-Titus work in progress during ChrisTitusTech stream, I definitely want to give AwesomeWM a try. What’s not to like about a small, quick and efficient window manager. ...

I have some peculiarities for my desktop setup that I use every time I reinstall a new OS. So instead of researching how to do the setup all over every time I reinstall an OS, dual boot, or distro hop, I will throw them all in a blog post and save some keystrokes and a bit of time. On my main computer, an old Dell Optiplex, with an NVIDIA GTX1650, I am dual-booting Kubuntu 20.04 and Windows 10. ...