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Ubuntu HowTos

Enable VPN in Kubuntu

Install OpenVPN plugin:

apt install network-manager-openvpn

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Bash HowTos

Mutiline prompt

PS1='\[\e[36;1m\]+----\[\e[0m\]\[\e[36m\]\[\e[30;1m\][\[\e[0m\]\$
\[\e[32;1m\]\w\[\e[0m\]\[\e[30;1m\]]\[\e[0m\]\n\$
\[\e[36;1m\]+--\[\e[0m\]\[\e[36m\]\[\e[0m\]\$
\[\e[37;1m\]\$\[\e[0m\] '

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Workaround for GIMP2 long font loading during startup

Navigate to %localappdata%\fontconfig\cache

Sort the files by date and check the most recent ones. There should be:

• some-long-hash (usually 1MB or more)
• some-long-hash.NEW (usually 1MB or more, slightly bigger that the one above if you added fonts)

Rename someverylongname to someverylongname.OLD

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Introduction

This document describes hot to build ares emulator from a source code on a Fedora system. This build uses GTK3 as this is the default version available in modern Fedora systems.

ares is a multi-system emulator that is a descendent of higan and bsnes, and focuses on accuracy and preservation.

• Official homepage of ares
• Source code repository on github

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Description

The instructions here cover upgrading Ubuntu droplet from one LTS release to the next one. This was used to incrementally upgrade from Ubutnu 16.04 to 20.04 via 18.04.

Instructions

Perform standard update

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#ifndef __F_WINHANDLES_HPP__
#define __F_WINHANDLES_HPP__

typedef void* HANDLE;
typedef unsigned long long WPARAM;
typedef long long LPARAM;
typedef long long LRESULT;

#define FORWARD_DECLARE_HANDLE(name) structname##__; typedef struct name##__ *name;
FORWARD_DECLARE_HANDLE(HINSTANCE);

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Python Embeddable

Introduction

This article describes how to add pip, install custom modules and use an interpreter form the embeddable package via batch files.

Download Python Embeddable

• Navigate to https://www.python.org/downloads/
• Scroll to Python releases by version number section and choose Download for a required version

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Add the following config to .zshrc:

# Load colors
autoload -U colors && colors

# Load version control information
autoload -Uz vcs_info
precmd() { vcs_info }

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Fedora HowTos

Set default grub boot entry in Fedora

The following instructions show howto setup default boot item in grub menu unser Fedora Linux. This may be handful in case of dual-boot setup when the default item must be set to another OS.

Method 1. Specifying boot item by name

This method commands should be launched again after installing new kernel during updates (as it re-launches grub2-mkconfig).

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ImageMagick HowTo

Resize and crop image

convert input.jpg -resize 100x100^ \
                  -gravity Center  \
                  -crop 100x100+0+0 +repage  \
        output.jpg