After dom0 update machine can not boot up


I was promoted to update dom0. After I updated the system wouldn’t boot up.

After a little investigation I found that Qubes had changed the kernel I was booting from 4.19.94-1 (which works) to 5.4.something which does not work.

I booted to a Linux (popos) on a USB stick and I changed the default kernel to 4.19.94-1 and I am back in business.

How can I stop a dom0 update from changing the boot up kernel for dom0?