You fixed my problem.
Now I have Ubuntu, Windows 10 and QubesOS on the same 1TB SSD.
Everything seems to work fine, I have sound and wifi.
To install it with Multiboot I just selected the SSD and Custom partition. Then in the custom partition I clicked “automatic partitioning” which detected the free space available on the SSD and created the right partitions there without overwriting other OS data.
I also tried installing Qubes OS on a 32GB USB but it appeared to be too small for Qubes.
My only concern is that when installing you are informed that this Qubes OS is in alpha so you shouldn’t use it outside of testing. So I guess when Qubes 4.1 is finally released I will have to delete everything and install it again. Still it’s nice to be able to use it.
Is the Intel firmware not included by default?
I’m sorry but I don’t think I can help you with this kernel issues, you seem to have much more knowledge than I do.