Anyone who recommend flatpak should note that flatpak is a big security hole itself by design. Flatpak is also SystemD-exclusive package manager. Snap is the same thing as flatpak. As for Appimage it's important to understand that Appimage is just an auxiliary way of software distribution. Consider Appimage as an advanced tarball. Of course, tarball is simpler and way more open thing than Appimage.

There is a problem: corporations are trying to force way of thinking incompatible with sane technical solutions.

I don't know what you have installed. Devuan has both of features you mentioned in the comment.

Looks like it was a problem with repos because according to apt-get there is emacs-lucid in the Ceres repo:

$ apt-cache search emacs-lucid
emacs-lucid - GNU Emacs editor (with Lucid GUI support)

I suspect you just couldn't get necessary packages, especially the ones related to d-bus and GTK. I think that was the reason why you had a problem with GTK UI for Emacs.

I suggest to install emacs-lucid instead of emacs-gtk. It won't solve entire problem because you have to install some of additional packages but it will solve the problem in case of GNU Emacs because GTK based GUI is trash.

Linus Torvalds is not developer - he is a small corporate manager today.

Any write operation is slowing down an SSD due to physical limitations. In practice the 'discard' option is just convenient thing with insignificant overhead.

You don't need to run TRIM command at all if you mount filesystem with 'discard' option.

Initially Arduino is 8-bit AVR-based board series with Arduino IDE. Form-factor of al of Arduino boards except arduino nano or similar ones is awful: it's large for final device and microcontroller is just soldered in. Thus it's a bad solution even as development board. For example, TI Launchpad is much better solution as devkit because it's full featured development board (it's based on energy efficient 16-bit MSP430 microcontroller). Some of new Arduino boards are based on ARM Cortex M core.

Arduino IDE is a nightmare. Yes - it's simple. But it's weak and doesn't let to learn anything. For example, from Arduino you won't understand how to send a signal through a pin: it's inside digitalWrite() function. This function is surprisigly inefficient and depending on version of Arduino IDE has different maximum frequency so it's hard to get predictable behavior when you need to use this board seriously. Arduino IDE doesn't let to build optimized code because it just doesn't give any way to set compiler options. Arduino IDE is also much more complicated than pure C with avr-libc. With Arduino IDE you'l never know how do you use CPU pins whereas in C with avr-libc you always know which port you use for sending a signal to a specific pin or group of pins simultaneously.

If you need data acquisition system you may look at ready-to-use solutions. You can find them as "USB ADC" or "External ADC". Search for devices with UART support: in this case you can use terminal for obtaining necessary data.

Raspberry Pi is also technically terrible solution. I don't know who designed RPi board but it's totally horrible. It's better to find industrial grade board with GNU/Linux support. You can practice with Raspberry Pi but be ready: Raspberry Pi will be broken eventually because it was not designed as a reliable device. Usually it ruining filesystem on SD card.

ISP - In-System programmer. It's a tool for firmware flashing. By the way, you can use Arduino board as ISP.

The simplest solution is ESP32 module with display. It has MCU, wireless communication and I/O pins.

Another solution is a board suitable for current task, NRF24L01 or similar module and a display for the board. I suppose you'l need an SD card slot. There are a lot of boards with STM32 (ARM Cortex M0-M4) microcontrollers. Recently STMicroelectronics made interesting thing: https://www.st.com/en/microcontrollers- … eries.html

If you want to learn MCU programming avoid Arduino. Arduino may be a good solution only for the case of noskill dirty and fast primitive things like led blinking. I also recommend to buy a cheap ISP for flashing the microcontroller (bootloader in Arduino is very unreliable thing). USBasp is suitable device. It's very cheap (the price is about 1-3$) and simple.

apt-get install gcc-avr libc-avr avrdude
apt-get install any-text-editor-or-ide-like-code-blocks

AVR libc official site and manual: https://www.nongnu.org/avr-libc/
A simple example of AVR programming: https://www.tldp.org/HOWTO/Avr-Microcon … /x207.html
Another example of AVR programming basics: https://www.swharden.com/wp/2013-01-06- … -in-linux/

However, if you don't want to program microcontrollers you can just install Arduino IDE from repository and use it before you drop it after a couple of weeks or even a month. You can also download latest version of Arduino IDE from official website, unpack and run it.

The simplest way to trim information from the log is awk

I suppose in the "Samsung_M2020_Series groucho 109 [27/Dec/2018:08:37:02 -0300] 1 1 - localhost H:\Desktop\flower_sm.jpg A4 -" entry the 6th word (in this case it's "1") is the number of printed pages. Therefore the following command will give a text table with date/time and amount of printed pages found by the word "A4":

cat /var/log/cups/page_log | grep A4 | awk '{print $4$5 " " $6}' > trimmed_log.txt 

You can process it in spreadsheet.

If you want to get total amount of pages printed by the printer you can use the following command:

cat /var/log/cups/page_log | grep A4 | awk '{pages += $6} END {print pages}'

In this simple example grep is a tool used to find log entries according to defined word and awk is a tool used to parse and write every entry found by grep in shorter format. The default field separator is space. You can modify expressions from the example for best result.

It's extremely easy if you have a home filesystem on different partition. Just perform clean installation overwriting existing system and don't format partition with home directories. The best way is to boot iso from usb stick. Another way is to make the root filesystem via debootstrap. In this case you don't even need an iso file with installer but you'l need to reconfigure GRUB or you won't be able to boot Devuan. You can also use qemu.

Try too find it in completed jobs of the printer (CUPS web interface). You will see table with information you need.