Nice work and install tutorial!

Here is a short collection of incedences on my excalibur:
Compiling: pkg-config --cflags --libs gtk+-3.0 throwed an error, solved by installing libgtk-3-dev .
Scraping: There were two or three instances of the script running, beside free cpu cores.
You mentioned "/var/lib/dpkg/status" and I thought this text file would be processed to get package related information.
dpkg was querried a lot (multiple ps ax in the terminal to kill time, e.g.: dpkg-query --search -- galculator.desktop )

#-#-#-#-#-#

Sorting:
A doubled "ParaView" entry cought my attention - see code section.

Guess is:
The list is sorted by the name of the *.desktop file. The shown "Application Name" is from the 'Name="Application Name"'-field.
*Highly accurate* entries like "Document Viewer" are existing too.
I'm missing a reference to the executed binary itself.
Or maybe executable name for sorting?

**imaginary screen shot of the program list**

(... "O" section here?!)
ParaView
QjackCtl
qpwgraph
samplev1
Wireshark
Mousepad
ParaView Cilent
(... more "P" entries)

**end of imaginary screen shot**

$ find | grep desktop$ | grep -i paraview
/usr/share/applications/org.paraview.ParaView.desktop
/usr/share/applications/paraview.desktop

$ diff  /usr/share/applications/paraview.desktop /usr/share/applications/org.paraview.ParaView.desktop
3,5d2
< Name=ParaView Client
< GenericName=Data Viewer
< Comment=ParaView allows viewing of large data sets
7c4,7
< Terminal=false
---
> Name=ParaView
> Comment=Parallel visualization application
> Exec=paraview %f
> TryExec=paraview
9,11c9,10
< MimeType=application/x-paraview;
< Categories=Education;Math;Science;
< Exec=paraview
---
> StartupWMClass=paraview
> Categories=Qt;Science;DataVisualization;

@Prowler_Gr  Thanks for the head up.

First reading this made me clone my debian-trixie-VM-with-sysvinit-enabled before trying apt-get udate; apt-get upgrade.
grub still boots /sbin/init as PID 1, so no harm done.

I'm not exactly sure what the removed part of code does - assumtion is the code enables a way to have sysvinit, systemd and upstart installed in parallel and select init via grub.

Moore likely the other way around: Ask an AI, then get your GPU toasted.

@Glen: Thanks for sharing. Appreciated.

I'm not having any problems running firefox and librewolf at the same time.

It's currently librewolf.appimage and firefox-esr from the excalibur repo. The appimage version should work on any devuan. I don't use librewolf from its debian repo for historical reasons (no sound on pure alsa).

As far as I understand the timer: The program 'certbot' will be executed either by systemd.timers (if systemd is running) or by cron (in case of devuan).
No need for adjustments. Or I'm just wrong.

It's kind of sick, that cron looks (or has to look) for systemd.timers, but anyway.

Dual-windowed file manger: mc / doublecmd
Image Viewer: This is a difficult one. Sometimes viewnior or nomacs (excalibur)
Screenshots: flameshot

It''s possibel to

apt-get install systemctl

Not sure whether this works for iscsi.

Sounds like a hardware problem.
I would pull out and insert again all RAM modus and PCI extension cards. This makes new electrical contact.
Since the PC has no external graphics card, this most likely means the RAM, as Pedro guessed before.

Assuming mate panel works similar to lxde ... .
Did you compare the "panel applet" configuration on both install? (GUI and config file)
Is the panel using a different plugin for the "panel clock"?

BIOS (or efi): Set time to UTC, not local time.
(Some flavour of) ntp should run in any case. If the time difference is too big, ntp might not want to sync.
Check insatllation's time zone settings: /etc/adjtime /etc/localtime /etc/timezone. Last line in /etc/adjtime should be "UTC".
E.g.:

$ cat /etc/adjtime
0.000000 1743786960 0.000000
1743786960
UTC

$ ls -l /etc/localtime
lrwxrwxrwx 1 root root 35  Mon 2024-07-01 19:25  /etc/localtime -> ../usr/share/zoneinfo/Europe/Zurich

$ cat /etc/timezone
Europe/Zurich

https://wiki.debian.org/DateTime

[ $(cat /sys/class/net/eth0/carrier) -eq 1 ]
is a logical expression. True, if the ethernet-cable is connected.

Marketing department is so funny ... Up to now I thought it would be a very old card. But it is "Pascal" archtecture, same as mine.

The following packages are manually installed on my system (excalibur, but should not matter):
firmware-nvidia-graphics firmware-nvidia-gsp nvidia-alternative nvidia-detect nvidia-driver nvidia-kernel-dkms nvidia-modprobe nvidia-settings nvidia-xconfig

You need to run 'nvidia-xconfig' to create 'xorg.conf'; otherwise X will not start.
Edit: Just found that there is no 'xorg.conf' and an empty 'xorg.conf.d' on my system.

apt-get purge nvidia-persistenced will do.

It's use case is a headless server for e.g. CUDA calculation.