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MTTI, some systems do not work on RTAI. I tried RTAI on my SO's laptop and it instantly kernel panicked each time.

Is it really too hard to state I have a xx xxxx computer ?
I don't want to go searching what ever the common name is for the HP machine your using .
Why is it people want to play 20 questions? Is it so hard just provide some simple information.
I'm really not interested whether you are the guy people go to support for or whether you can program in 27 million different languages, that information does not help with the issue at hand.
A normal person would have said I've got XYZ PC and after installing Linux I can't boot from the installation drive. Not I can't install to a USB drive and expect us to know you've tried to install to an internal SATA drive or whatever. We can't read minds, we can only work on the information provided. Surely you must understand this ?
Support is a 2 way street, you need to provide the correct and relevant information so you can be given a correct and relevant answer. So far this has not been the case, you mentioned something about running commands as the superuser but made no indication of what they were no the output.
This is not the World of Windows where you will be told to "update to the latest drivers".
The reason for my troll comment was because you seemed to not want to give a lot of info, or it would seem directly reply to any suggestions. Installation issues regarding any other OS other than the provided Linuxcnc image is beyond our scope of support, but generally we are a helpful community.
But before anything else I would run a live Linuxcnc session and do a latency as described in the docs. If this does not pass I would either reconsider the suitability of the PC in question.
Another to have a search for is for any issues in general regarding installing Linux on your model of PC.
As for Mint or Ubuntu or any other flavour of Linux their respective forums are the best place to get support with installation issues.

Also valid points timo. thank you

I am sorry that I was not more detailed about all the things I tried. But to be clear, I did try all the most obvious things first. I am new to Linux but have installed countless OS systems since the first computers came out. I have programed in over 5 languages, I am just new to Linux and I am amazed how much trouble I am having. The photos I uploaded should help identify the problem."Since you have not even mentioned the PC you are trying to install on" The my system photo should have the information about it. What info do you need that is not there? I am happy to provide what anyone may need to help me solve this problem.
"it appears the machine is attempting to connect to a boot server" I noticed that too, and I think it is related to the “UEFI: IPv4 Realtek PCIe FE family controllers” that keep coming back. I did not set up any IP connection info during the install attempts but did have a Ethernet connected for some installs for working with the "live" versions that did work. Using the sudo commands to get any bootloader\grub and other required files that may not have been in the install ISOs. I disconnected the ethernet connection during the last attempted install, But I will keep trying with other suggested ISO downloads with it disconnected.
"Linux is case sensitive as well, be sure to respect this" Thanks, I may have used some lower case letters that needed to be upper case on some script entries but mostly I copy and paste the exact scripts to be certain. I will get to trying the provided suggestions now and get back with the results. Thank you again for all the helpful suggestions.

Danke fürs Draufgucken, Jens!
Also die drei oberen Einträge kommen direkt aus dem Github mit der Probe Basic Installation, da hab ich auch nichts dran geändert. In der custom_connfig.yml stehen wohl Einstellungen für die GUI drin, aber alle relevanten stehen auf false, und da ist nichts zu sehen von feed-override. Eher Screen Angaben ob das grid gezeigt werden soll usw. Wenn ich die nicht lade geht auf dem Maschinen Bildschirm nichts.
DIe user_tabs und user_buttons hab ich mal nach feed* durchsucht, da gibts nur Einträge zum Feed Hold Button. Kein override, kein slider.
Es muss aber was Probe Basic Spezifisches sein, denn ich hatte vorher einige Zeit QTDragon installiert, da ging der Regler auch während einens Programmablaufs.

Pfeiltasten hab ich tatsächlich noch nie probiert! Würde ich auch nicht benutzen, ich hab das Handrad und die Buttons auf dem Touch Bildschirm das reicht mir. Aber gut zu wissen dass man das einschalten könnte.
- funktioniert wieder nicht - ja die Unerklärbarkeiten... ich hab da auch noch einige

Ich glaube ich wechsle mal mit dem Thema aus dem DE Bereich zum QTVCP/Probe Basic, da ist auch der Entwickler Chris unterwegs vielleicht kann der was dazu sagen. Sonst habe ich hier im DE Bereich eig. immer zielführende Antworten von den Mods und ganz Aktiven gehabt. Scheint ein seltsames Problem zu sein.
Danke Dir bis hierhin!
LG Hanno

If you are using the Linuxcnc 2.9.4 images, and as you claim have any rdp or vnc packages installed it means the images themselves have been compromised. If this is the case I would make a report either on the mailing list or github pages. Links to these can be found at the Linuxcnc homepage.
The copy of the image that I am running on my RPi5 does not have any of the packages pre installed. The images I am using are the ones that I built and submitted to be put on the downloads page.
This is a very serious situation, so I want you think about whether you are using the Linuxcnc images that have been downloaded from the Linuxcnc downloads page and carefully rethink your statement that you did not install these packages yourself.
As I said this is a very serious matter and must be dealt with accordingly.

You specifically stated that you were trying to install to a USB drive.
Why would anyone assume that you had tried to install to an internal SSD\HDD\NVME. We can only work on the information provided.

Being an experienced Linux user, I would say that the bootloader\grub has not been installed.
When you attempted to install with UEFI enabled was there a UEFI partition created ?
Are you fully reading the dialogs during the installation process ?
Since you have not even mentioned the PC you are trying to install on it's hard to make any proper diagnosis.

Have you disabled net booting in the BIOS, as it appears the machine is attempting to connect to a boot server, tho in reality it should try to connect to a dhcp server first to get an IP address and the IP address of a bootp server.

Something that may be of use is to install Debian, install the bootloader as per dialog screen and attempt to boot. If that fails as it has before I would recommend that you read this article.
www.system-rescue.org/disk-partitioning/...ring-a-damaged-Grub/

As you are new to Linux.
When typing commands before sure to type everything as recommended. Double and even triple check before pressing the enter key. Every period,comma and slash is crucial. Linux is case sensitive as well, be sure to respect this. If a command doesn't work as expected 99% of the time it is the user at fault.

One thing that comes to mind, is there any setting, hidden or otherwise that prevents the boot sector being written to ?

Thank you for all the suggestion and I will try them all even the more obvious ones that I have already done. I know this installation should have been easy. This is why I am so surprised that after trying everything for days I am forced to ask for help. I have been doing the more obvious suggestions but I think it must be something not so obvious I just can't see yet. I will try everything suggested and hope for the best. "do not change stuff at random in BIOS" Always good advise. The "do not use sudo or whatever else during install" the sudo commands is not used during installation, that is for after a live version was working because a terminal is needed for that" Again, I am new to linux so I am still learning.