Hey there! I’ve tried many times to install Qubes OS, but I keep encountering errors like ‘modprobe: ERROR: could not insert ‘floppy’: Device or resource is busy.’ Additionally, I see the error ‘(XEN) APIC error on CPU0: 08(08), Receive accept error’ in verbose mode.
I don’t want to rewrite my issue,just check my issue on github - LiveCD booting problem · Issue #8556 · QubesOS/qubes-issues · GitHub
Can you provide more information on the hardware that you are using? Is this an Intel NUC, by chance? If so, check this bug report too: io-apic issues on install boot for 4.1 NUC10i5FNH · Issue #6372 · QubesOS/qubes-issues · GitHub
I asked the same question on the issue 
Reply LiveCD booting problem · Issue #8556 · QubesOS/qubes-issues · GitHub
We think alike! Interestingly enough, there seems to be a known xcp issue with that configuration. See here: Unable to boot installer with AMD Ryzen APUs · Issue #206 · xcp-ng/xcp · GitHub, so this could be a problem with Xen itself.
UPDATE: When I enabled CSM, I only encountered a few errors with “(XEN) APIC error on CPU0: 08(08), Receive accept error,” after it the booting continued normally. However, after reaching the “udev waiting for complete device initialization” stage, I noticed that it was unable to complete the initialization (screenshots 3 and 4). I have read online that this issue can be resolved by using an external drive and install Qubes on another pc. I think that this issue related with nvme ssd in my pc