Monday, June 5, 2023

How to sync the time between 2 Ubuntu systems on an isolated network

›
I wanted to match the times between two systems on an isolated network running Ubuntu 22. This can be done using chrony ( https://chrony.tu...
Monday, April 3, 2023

How to create a Arm64 Ubuntu virtual machine using Virt-Manager

›
I wanted to run Ubuntu on an Arm64/Aarch64 virtual machine on a host Intel Linux computer for the longest time for compiling binaries for R...
Monday, March 27, 2023

Convert a sequence of JPG images into a MP4 video using FFMPEG

›
If you have a sequence of images like the screen shot below, it is quite straightforward to use ffmpeg to concatenate them into a single vi...
Monday, January 30, 2023

Fixing a kernel panic error when installing Ubuntu 20.04 in VirtualBox

›
I was trying to create an Ubuntu 20.04 virtual machine using Oracle VirtualBox but I kept encountering this error with the message " ...
Monday, December 12, 2022

How to read an array from a ROS1 launch file into a C++ vector variable

›
I was having problems reading an array of doubles in a ROS launch file into a vector variable in a C++ ROS1 program node. After some digging...
Monday, December 5, 2022

Using GIMP to copy an image layer into a channel

›
In GIMP, it is possible to copy a colored image layer into a single grayscale channel. Here's how to do the job. Create an empty channel...
Monday, November 28, 2022

Using GIMP's color channels to remove blue guide lines from inked line art

›
Penciled comic book art typically have blue guide lines (and text) as shown in the screen shot below.  The sketch can be downloaded from thi...