Step-by-step – Build Kernel Debian Bullseye

Installing

7. 7. Installing Kernel

   Finally, to Install Debian Custom Linux Kernel
   Simply play:

   sudo dpkg -i ../linux-image*custom_*.deb ../linux-headers*.deb

   And this setup includes also the Custom Kernel Headers that you don’t will find online…
   And finally reboot with:

   sudo reboot

   Finally, you should boot into your barely new Debian Linux Kernel :)
   To check it run:

   uname -r

   In case of Issues you still can choose the previous one on the GRUB Splash Screen.