I ran into problems using Ventoy - 4.1.2 works, 4.2.0rc5 can not access its files in the ISO after it starts, and the failure mode doesn’t make that clear.
Running this produces a thumb drive works - $1 is the ISO, $2 is the device ID.
Perhaps. On Librem 13v2 I had issues with several different messages, depending on how I installed Qubes 4.2RC5 to the USB.
I hypothesized that part of the issue is that the Librem 13 had two drives. The original drive and an added SSD.
I used a live Linux, and used gparted to format the SSD I wanted to install to.
I also used Windows to do a long format to the USB to fat32. I installed the USB installer (write iso to drive) that is in Mint Linux, I think it is the same USB installer, is in Ubuntu, and some other versions of Linux.
Immediately sorted itself out. and Installed to drive.
Just one experience. I suspect it has some kind of problem polling drives.