It is what I would try. but, I gotta be honest. I have never seen this error message before, failure to verify. I am suspicious about others hardware, whether it will easily take Qubes, and what special thing the person doing the install is doing. That is, some try a dual boot, and don’t tell us when asking questions. Some more advanced pieces of hardware are not accounted for yet in the Qubes. You mention an Ultra 9, I think you might required a later kernel, that question is really beyond my experience. The later kernel in the install might not have the verification. But that only means, if you run the verification, and it completes correctly and the install crashes again, you would try the later Kernel.
I receive Social Security, and as I am poor, I am usually hesitant to recommend to spend even a little money. Like buying a new USB. Or whether there is an easy way to overwrite the USB you have. and be sure nothing on it is corrupted.
but yeah, Bare Metal Mint. to download the Qubes ISO.
Use Mint to write the image to the -Qubes 4.2.4 ISO to the USB.
I read in the HCL that others have Ultra 9. and seems to work.
Then the next stumbling block would be to make sure that Qubes ISO is set to handle the graphics card.
Likely you have seen that. Not sure how much more advanced what they installed than the standard Qubes ISO, or whether the standard Qubes ISO would not work.
and just write over the Mint, not attempt a dual boot. While I would guess you are the kind of person who is attentive to detail. Make sure the BIOS/EFI is set to Legacy, and the virtualization is turned on.
So, ?? I am a person who tries things. I don’t always try to spend a lot of time analyzing error messages, which some here are more competent to do than myself.
So if it failed while trying to write over the Mint Linux on the drive, I would format the drive and try again.