hkern0

Some boxes like Geekom IT12 with modern Linux like Mint 22 (wilma) or Ubuntu 24 (noble) based on Linux kernel 6.8 fail to start the Bluetooth adapter. This is how to resolve this initialization error.

linux kernel bluetooth present Geekom Mini PC error driver bluetooth 4.1

Mouse middle-button scrolling in LinuxMint / Ubuntu

10 / 2024

Configure Linux Mint 21-22 to scroll when middle button mouse wheel is clicked.

Linux linux mint mouse middle-button scrolling windows configure x11 xorg.conf xorg.conf.d

Linux: Route ip traffic through an interface

9 / 2024

How to route IP traffic to a certain range of IP addresses to a particular network interface

networking routing interface device subnet ip range ip

Linux: Enable or disable a network interface

9 / 2024

How to enable or disable a network interface in Linux

Linux network interface enable disable command-line

Linux: File association and preferred application by extension

8 / 2024

Define a file-type by extension in Linux and set a preferred application associated with it.

Linux windows file associations preferred application by extension filename extension file extension mime desktop

Linux: Rename multiple files with pattern-matching

6 / 2024

rename 's/searchpattern/replacepattern/' fileglob

Use -n option to do a dry run.

Not available as standard in all Linux flavors.

Linux rename multiple pattern Ubuntu

Fix a dim screen on Lenovo P500 IdeaPad laptop

8 / 2023

The fix for persistent screen dimness (loss of brightness) on Lenovo P500 IdeaPad laptops.

Lenovo P500 IdeaPad laptop screen dim dimness bright correct fix backlight brightness

Kill a process

8 / 2023

How to kill a process in Linux

kill process killall

NGINX: Basic Authorization password-protecting sensitive website areas

6 / 2023

How to simple password-protect areas of a website with auth_basic NGINX-integral first line of defense.

Linux: Mount Google Drive in Mint and Ubuntu

6 / 2023

How to mount a Google Drive in Linux Mint / Ubuntu.

Ubuntu linux mint mount device google drive

Create a local development certificate authority and SSL certificate WITHOUT mkcert()

3 / 2023

How to set up a local development certificate authority and local SSL certificate on a local development environment HTTP server without using mkcert().

Compare and verify files using CRC, hash, signature, or fingerprint

3 / 2023

How to verify files and certificates using hashes, CRC checksums, signatures, and fingerprints

About

2 / 2023

This website is a collection of notes.

Ubuntu Linux: Unzip .sql.gz file directly into a MySQL database

2 / 2023

To unzip a .sql.gz file directly into a mysql database: gunzip < exampledb_backup.sql.gz | mysql -uexampledb_user -pexampledb_password exampledb

unzip .gz .sql.gz gunzip mysql database backup restore

Linux: Show all non-system users

2 / 2023

In linux to show all non-system users: awk -F'/:' '{if ($3 >= 1000 && $3 != 65534) print $1}' /etc/passwd

Linux: Add new user

2 / 2023

Add a new user to Linux: adduser username

add user adduser useradd usermod

Ubuntu Linux: Install NGINX HTTP server

2 / 2023

How to install the NGINX HTTP server in Ubuntu Linux

Drupal-7: Drush rebuild registry

2 / 2023

How to install and run the Drush command registry-rebuild.

drush rebuild registry registry-rebuild drupal 7 yad7 clear cache moved module

Ypage module

1 / 2023

Ypage uses stock Drupal 7 content and taxonomy fields to integrate content and taxonomy together in website navigation and presentation.

SSL keys and certificates

1 / 2023

SSL, secure HTTP, and certificates

Local development certificate authority and SSL certificate USING mkcert()

1 / 2023

How to set up a local development environment as its own Certificate Authority (CA) using the mkcert() utility

Bypass secure browsing restrictions in Chromium and Chrome

12 / 2022

If you are doing local development and using no SSL transport or your own self-signed certificates, you may not be allowed to view your development sites.

thisisunsafe chrome chromium secure browsing override

Flip screen in Ubuntu / Linux Mint

12 / 2022

If the login screen doesn't detect your upside-down screen, here is a quick fix

xrandr xorg flip screen Ubuntu

Basic docker commands

11 / 2022

version: show basic version information docker version
info: runtime information docker info
search: find images docker search example
pull: download and install an image docker pull hello-world
run: run an image docker run hello-world
container: see status of containers docker container
images

docker commands introduction

Installing the Docker CLI

11 / 2022

How to install the Docker command-line interface.

docker Manjaro Linux getting started

Arch Linux: Using the Package Manager (pacman)

10 / 2022

How to install, remove, and list packages using Arch / Manjaro Linux pacman package manager.

package manager pacman display install remove package packages Manjaro Arch Linux

Linux: Make a CD ROM accessible

9 / 2022

How to mount the CD ROM in Linux to make it accessible.

mount device Linux access cd-rom

Linux: Enable Virtualbox Host / Guest communication through Host-only-network with Guest access to internet

9 / 2022

How to set up Host-network for Host / Guest communication and simultaneously route Guest communications to Internet through Host assuming Manjaro / Arch Linux Host and Ubuntu Guest.

Arch Linux Manjaro VirtualBox Host-only networking Guest access to internet Ubuntu guest

Manjaro Linux: Enable time server synchronization

9 / 2022

How to enable time server sync in Manjaro / Arch Linux if it is not enabled.

time sync synchronization time-server service how to enable Manjaro Arch Linux

Arch linux: How to Install Nginx webserver

9 / 2022

How to install the NGINX webserver in Arch Linux

LEMP nginx Arch Linux install

Arch linux: install mysql / mariadb SQL database manager

9 / 2022

How to install the Mariadb (mysql SQL database manager) in Arch Linux

web server LEMP LAMP Arch Linux mysql server mariadb server

Linux: Add user to existing group

8 / 2022

How to add a user to a group in Linux

command-line add user group command mod usermod adduser useradd. usermod moduser

Linux: Keychron keyboard function keys not working

8 / 2022

How to make the function keys work on Keychron mechanical keyboards.

Linux: Packages kept back

8 / 2022

How to resolve the packages kept back message.

Linux: Erase / wipe a device (disk, USB stick)

12 / 2021

How to erase or wipe data off a device in Linux so its previous contents should not be recoverable.

wipe disk overwrite data wipe device erase disk erase device unrecoverable USB stick disk backup

Y: query for entities (nodes) in YAD7 / Drupal-7

12 / 2021

Query a YAD7 / Drupal-7 database for entities with an example for nodes.

drupal-7 entity node query EntityFieldQuery

Y: make a callback plugin for Drupal-7 / YAD7

12 / 2021

How to make a Y callback plugin for YAD7 Drupal-7.

Drupal-7: Apply database updates

12 / 2021

How to apply database updates in Drupal 7 / YAD7 databases using Drush or Drupal7 admin interface.

drupal 7 drupal7 drush apply database updates yad7

Drupal-7: Set private, public, and temporary directories with Drush or settings.php

12 / 2021

How to set the private, public, and temporary directories with Drush or settings.php

settings.php drupal 7 configuration files private directory public directory temporary directory drush

Linux: Find and fix USB stick (or other disk / device) errors

11 / 2021

Find and fix bad blocks in Linux on a disk or device (such as a USB stick)

USB stick disk errors find fix Linux bad blocks bad sectors badblocks umount fsck disk maintenance

Git: Add remote

10 / 2021

Add a remote to a Git repository

add remote repository

Linux: Make bootable USB stick from ISO file

8 / 2021

How to make a bootable USB stick from an ISO file using the Linux command-line

Linux: Tar - create / extract .tar.gz compressed archive files

6 / 2021

Use tar to create and extract compressed .tar.gz archive files

Linux command-line tar archive .tar.gz compressed tar.bz2 bz2 bzip2

Y: Form Layout overrides

4 / 2021

How to override the final presentation / formatting of a form using a Layout.

Y: Making a Voom plugin

4 / 2021

How to create and invoke a Voom plugin.

Linux: desktop remote-control using vino-server and vinagre remote desktop client

4 / 2021

Here is one way to set up remote desktop control for your Linux desktop / graphical user interface / virtual network computing / VNC.

Ubuntu remote desktop VNC Vino vino-server remote desktop server virtual network computing vinagre VNC client setup VPN secure Vino server virtual private networking tinc

Linux: Decrease swap file size

4 / 2021

Most of the available guides show how to increase the swap filesize in Linux, by building a larger file initialized to zeros.

This shows how to reduce the existing swap file without writing a whole new file with zeros.

swap file swapfile reduce decrease size resize how-to instructions Linux linux mint Ubuntu

Linux: Setting up MYSQL server database administration

4 / 2021

Some concepts to implement MYSQL security in a LEMP server.

Linux: What am I running? Version? Kernel? Distribution?

3 / 2021

Periodically, you will scratch your head and ask the perpetual questions: Am I using Bionic Beaver, Xenial Xebec, Risky Rhesus? Ubuntu? Debian? Which kernel? OMG?

This article tells how to figure out the parameters of your Linux system.

Linux Ubuntu linux mint system information configuration OS version kernel version

Drupal-7: Install Drush using Git (without Composer)

3 / 2021

How to install Drush for Drupal 7 / YAD7 without using Composer

drush install without composer download drupal 7 yad7 drupal shell installation

Drupal-7: admin hook_menu() parent stub

2 / 2021

Sometimes, you want a menu / routing item as a placeholder and to have it fill in the sub-items automatically. This is how to do that.

Linux: Install Tinc VPN mesh networking on systemd, Ubuntu, Arch, and Manjaro Linux

12 / 2020

How to Install the Tinc VPN on an systemd Linux sites such as Ubuntu, Linux Mint, Arch, and Manjaro.