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Ubuntu HowTos

Enable VPN in Kubuntu

Install OpenVPN plugin:

apt install network-manager-openvpn

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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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VirtualBox HowTos

Manually sign VirtualBox kernel modules on Linux to run with SecuteBoot

Part 1. Generate custom keys

• Install mokutil package

sudo dnf install mokutil

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Windows HowTos

Force "Details" folder view to show standard columns in folders with music files

• Go in to the folder's Properties
• Select the Customize tab
• Under the section What kind of folder do you want? change the Optimize this folder for: option from Music to General Items.

Source: https://superuser.com/a/1478697/1860262

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WinDbg Cheatsheet

Get WinDbg installation files

• Download WDK installation tool (https://learn.microsoft.com/en-us/windows-hardware/drivers/other-wdk-downloads)
• Download WDK files
• Locate X86 Debuggers And Tools-x86_en-us.msi and X64 Debuggers And Tools-x64_en-us.msi

Basic commands

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Java HowTos

Switch between multiple Java versions in Linux

Use

sudo update-alternatives --config java

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ffmpeg HowTos

How to downsample 4k to 1080p using ffmpeg while maintaining the quality?

ffmpeg -i orig.mp4 -vf scale=1920:1080 -c:v libx264 -crf 20 -preset slow smaller.mp4

• Source: https://video.stackexchange.com/questions/14907/how-to-downsample-4k-to-1080p-using-ffmpeg-while-maintaining-the-quality

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Typical paths in Gnome

~/.local/share/backgrounds
~/.local/share/wallpapers

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See also: Build ares emulator on Fedora – a newer emulator based on Higan/bsnes source code.

Introduction

This document describes hot to build higan emulator from a source code on a RedHat-based system (including Fedora and CentOS).

higan is an emulator for a number of classic video-game consoles of the 1980s and 1990s, allowing you to play classic games on a modern general-purpose computer.

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LVM HowTos

Fix 'PV header' LVM Warning

Sometimes the following warning may appear during usage of pvs, 'vgs, lvs utils:

WARNING: PV /dev/vdb in VG vg_test is using an old PV header, modify the VG to update.