This exact same issue has happened to me as well. I attempted to run a livecd of Ubuntu 19.04 on a HP g72 notebook PC and came across this exact error.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1743798 Title: Kernel sometimes panics during early boot if CPU microcode archive prepended to initramfs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1743798/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs