Gangmax Blog



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Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. I install Nix to use boot.

Green Recorder

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From here.

Green Recorder is a desktop screen recording app for Linux. You can install it with the following commands on Ubuntu 16.04+:

sudo add-apt-repository ppa:mhsabbagh/greenproject
sudo apt update && sudo apt install green-recorder


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WebSocket is a computer communications protocol, providing full-duplex communication channels over a single TCP connection. It is designed to be implemented in web browsers and web servers, but it can be used by any client or server application.

How to Fix Missing GPG Keys

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When I was running “sudo apt-get update” and a sudden power off happened. After restarting Ubuntu, I find the following error after running “sudo apt-get update” again:


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ZooKeeper is a high-performance coordination service for distributed applications. It exposes common services - such as naming, configuration management, synchronization, and group services - in a simple interface so you don’t have to write them from scratch.