How to install old kernel?

It won't be, as by installing it this way, it will be set to "manually installed." Only auto-installed are subject to autoremove.

sudo apt install linux-headers-5.13.0-28-generic linux-modules-5.13.0-28-generic linux-modules-extra-5.13.0-28-generic linux-image-5.13.0-28-generic

If necessary, please see here:

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