Chemtool: Open-source Chemical Structure drawing program

Chemtool is a lightweight application for drawing chemical structures like organic molecules. It's originally written by Thomas Volk from Germany. Later on, more developers came to aid for development and code maintenance. [...] The program is created for Linux X systems, it does not work on Windows or macOS. License Chemtool is released under GNU General Public License.

today's howtos

• Do You Need a Boot Partition in Linux? - Make Tech Easier

  If you fire up a partitioning tool and point it at your hard disk drive, it’s quite probable you will see a small boot partition before everything else. It may only eat up a tiny fraction of your hard disk drive and not appear when actively using the computer. Is that partition essential? Can you delete it? Read on to find the answers to whether you need a dedicated boot partition on your Linux installation.

• How To Install SQLite on Ubuntu 20.04 LTS - idroot

  In this tutorial we will show you how to install SQLite on Ubuntu 20.04 LTS, as well as some extra required package by SQLite

• How to Quickly Set Up a Mail Server on Ubuntu 20.04 with Modoboa

  Quickly set up your own email server on Ubuntu 20.04 with Modoboa, which is a free and open-source mail hosting and management platform designed to work with Postfix SMTP server and Dovecot IMAP/POP3 server.

• How to install the Kubernetes dashboard > Tux-Techie

  The Kubernetes dashboard provides a way to manage your Kubernetes cluster from your browser. You can easily check CPU usage, memory usage, and overall health of your cluster with the dashboard. You can also deploy applications from the dashboard and much more. In this tutorial, we will show you how to install the Kubernetes dashboard on a cluster running in Ubuntu 20.04. We will also set up an admin account and log in to the dashboard with a token. Check out this article to learn how to set up a Kubernetes cluster.

• Beginner's guide to NGINX SSL CONFIGURATION - The Linux GURUS

  Security is one of the main concerns that needs to be addressed on priority for all applications or websites. All websites are required to have a valid SSL certificate installed in order to encrypt the data packets/traffic between users & websites. Even web browsers show a warning when we visit a website that does not have SSL certificate installed. In this tutorial, we will discuss how we can perform Nginx SSL configuration to configure a SSL certificate to secure our websites hosted on Nginx. So start the complete process for Nginx SSL configuration but let’s discuss the prerequisites first.

• Pandora Client Pithos 1.5.1 Released [Ubuntu PPA] | UbuntuHandbook

  Pithos, native Pandora Radio client for Linux, released version 1.5.1 a day ago with minor bug-fixes and improvements. [...] If you’re OK with the containerized flatpak package. Pithos 1.5.1 has been made into flathub.org for most Linux systems. For those prefer .deb package, the unofficial PPA is available for Ubuntu 18.04, Ubuntu 20.04, Linux Mint 20, Ubuntu 20.10.

Cosmo Communicator’s Linux OS gains new cover screen features

The Cosmo Communicator is what you’d get if you crossed a smartphone with a pocket-sized laptop computer. Unfolded it looks like a tiny laptop with a keyboard inspired by the design of the classic Psion Revo PDA. Fold it and you’ve got a smaller cover screen that you can use for phone calls, notifications, or other simple tasks. Aside from the clamshell design, the phone has another unusual feature: it typically ships with Android, but can also support alternate operating systems including Debian Linux and Sailfish OS. Developed by Planet Computers, the Cosmo Communicator went up for pre-order through a crowdfunding campaign in late 2018 and began shipping to backers in mid-2019. Now Planet Computers has announced an update for the Debian Linux software that runs on its phone, bringing support for a bunch of new cover screen features.

Snap speed improvements with new compression algorithm!

Security and performance are often mutually exclusive concepts. A great user experience is one that manages to blend the two in a way that does not compromise on robust, solid foundations of security on one hand, and a fast, responsive software interaction on the other. Snaps are self-contained applications, with layered security, and as a result, sometimes, they may have reduced perceived performance compared to those same applications offered via traditional Linux packaging mechanisms. We are well aware of this phenomenon, and we have invested significant effort and time in resolving any speed gaps, while keeping security in mind. Last year, we talked about improved snap startup times following fontconfig cache optimization. Now, we want to tell you about another major milestone – the use of a new compression algorithm for snaps offers 2-3x improvement in application startup times! LZO and XZ algorithms By default, snaps are packaged as a compressed, read-only squashfs filesystem using the XZ algorithm. This results in a high level of compression but consequently requires more processing power to uncompress and expand the filesystem for use. On the desktops, users may perceive this as a “slowness” – the time it takes for the application to launch. This is also far more noticeable on first launch only, before the application data is cached in memory. Subsequent launches are fast and typically, there’s little to no difference compared to traditionally packaged applications. To improve startup times, we decided to test a different algorithm – LZO – which offers lesser compression, but needs less processing power to complete the action. As a test case, we chose the Chromium browser (stable build, 85.X). We believe this is a highly representative case, for several reasons. One, the browser is a ubiquitous (and popular) application, with frequent usage, so any potential slowness is likely to be noticeable. Two, Chromium is a relatively large and complex application. Three, it is not part of any specific Linux desktop environment, which makes the testing independent and accurate. For comparison, the XZ-compressed snap weighs ~150 MB, whereas the one using the LZO compression is ~250 MB in size.