Rebuild kernel so complicated?

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AFAIK, rebuild the kernel should follow those steps at least:
  • copy /boot/system-$(uname -r).map to ${kernel_src}
  • copy /boot/config-$(uname -r) to ${kernel_src}
  • cd ${kernel_src}
  • make menuconfig, save config(If I don't wanna change anything for test).
  • make -j9 bzImage.
  • override /boot/vmlinuz-$(uname -r) with ${kernel_src}/arch/x86/boot/bzImage
Maybe those steps contains some typo or has some different paths. Buts the point is I don't change any features from original setting, I just copy my system.map and config to kernel source's one and rebuild the kernel(should be the same with mine).

When I override new kernel and reboot, It just hanged, no any message print out(No Oops, No panics). But if I do those steps with this, everything goes fine. I just don't know the differences between the standard way and debian's way. Is ubuntu abnormal ?
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