Tried every net solution for days to install linuxcnc

Totally agree mate.
One thing I would like to add, is carefully read the dialogs in the installer.
99% of the time when things don't work the issue is with the user.
Tho I still have my doubts....

"But some of this is starting to sound like a troll, based on your previous answers as to where you installed the boot loader. And the fact you never mentioned you tried installing to an internal hard drive to begin with"
Because it is the first and most obvious/logical thing to try first I thought it may be assumed that was the vary first thing I tried. I am a first timer here on this forum trying to get solutions to what should have been a straight forward installation of an OS. Not sure about the troll comment. I am hoping that experienced linuxcnc users may know what could possibly be wrong. I am usually the one people go to for tech support, but I am new to Linux in general. The key things that may help solve this problem are that, some install say they have "successfully competed the installation" only to say on reboot that no drive internal or USB external was found with a bootable OS. Also how that the “UEFI: IPv4 Realtek PCIe FE family controllers” keep coming back after they are disabled in the bios. It seems they are both big clues that I don't know about. Anyone else think there is something odd about that?

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.

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 ?

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.

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.

I have a HP computer 110-210, The system info is in the first photo provided “Mysystem.jpg” I will send a photo of the label on the side of the box if you like, but it has less info than the detailed system info. Sorry to provide to much background info on me, but is was suggested that I did not try the obvious things first like using the default settings or installing to my main internal drive first.

"unknown" said “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.” I though with all the photos like “my detailed system info” I was providing too much info. If there is something missing from all the info and photos provided, I am happy to provide it.

I saw the latency test while in live mode. It asked to do things like stress my system that I could not do yet like running motors I think. But it did not seem like it would prevent my “successful installs” from being found on ether hard drive” Do you think they are related? Now that you have seen my system info, do you feel that my system is not capable of recognizing a successful install on ether of my hard drives?

Update… I thought trying installs without the Ethernet connected may help avoid the “UEFI: IPv4 Realtek PCIe FE family controller” coming back and interfering with something, but the install made it clear it wants to be connected to get all needed files. So I am starting over with it reconnected. I am currently trying “rodw” suggestion to see if this ISO “debian-trixie-DI-alpha1-amd64-netinst.iso” will be found after a successful install I hope. I did see it said Debian13, so maybe it is more stable than the others I have tried. Unless the problem is something else. I will post the results of this install attempt using the suggestions like “Be sure to select Mate or XFCE desktop “ but the sudo commands would need to be in a live mode terminal if the install fails.

Debian 13 is still in testing. Debian 12 is the current stable version. So no Debian 13 (Trixie) is not more stable than Debian 12 (Bookworm). Honestly I would stay away from Trixie based on your Linux experience. Stay with the version that actually has been released rather than a version that is still in testing.

I would also look for any HP forums that discuss your particular machine as it maybe a "HP issue" with some input from Microsoft that is causing the issue, not a "Linux issue".

But have you followed my advice regarding testing the latency of the computer ? If the latency is not suitable I wouldn't bother trying to install Linuxcnc on that machine.

You keep mentioning "sudo commands" but give no indication to what these areor what they are supposed to do, do you see this is another issue where you are not supplying information, do you need this information beaten out of you (this does not mean an actual beating, but this how frustrating you are being). Would these be related to HP's buggy uefi and having to rename some boot files.

Rodw, you said "Be sure to select Mate or XFCE desktop" The defaults in your suggested ISO / Debian 13"are "Debian desktop environment", then "Gnome" and "standard system utilities". All preselected. Not selected are "Mate and Xfce" among others. Do you feel going with the preselected defaults will cause the "can not find a bootable drive" error problem? or should I just go with the defaults? If I don't select some of the unchecked software options on this install page, will it cause my system to not install or just not find the bootable OS on reboot? It does say "the core of the system is installed"