I'm not able to reproduce this on a physical host. Works just fine for
all the 32-bit kernels that I tested. When you say 'black screen', do
you not get anything at all? Not even some BIOS flickering in the
beginning?

What do you get when you run the following:
$ qemu-system-i386 -cdrom xubuntu-18.04-desktop-i386.iso -enable-kvm -m 2047
$ qemu-system-i386 -enable-kvm -nographic -kernel 
/boot/vmlinuz-4.4.0-122-generic -append "console=ttyS0 earlyprintk"

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https://bugs.launchpad.net/bugs/1767857

Title:
  Kernel 4.4.0-122 Breaks qemu-system-x86

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