When you manually compile and install a new Linux kernel, the initramfs (initial RAM filesystem) must be rebuilt because it contains kernel modules and other files required for the early boot process. If you don’t update the initramfs, the new kernel might fail to boot properly, as it may not have access to the required modules for mounting the root filesystem.
B - After compiling and installing a new kernel, you must generate an initramfs for the new kernel version and update your boot loader configuration to recognize the new kernel and its initramfs. These steps ensure that your system can properly boot using the new kernel.
B.
The initramfs isn't installed during kernel installation, in the other hand, you'd built a new one for the new already installed kernel.
E.g: After you install the kernel, you should run the following commands in order to install a new initramfs version:
# sudo update-initramfs -c -k [kernel-version]
# sudo update-grub
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