Ubuntu 23.10 - How to build a kernel package from kernel.org

First step is to install needed packages, open a terminal and type the following,

sudo apt install build-essential libncurses-dev flex bison debhelper libssl-dev libelf-dev

Now download your kernel source from kernel.org, you can do this using the terminal if you wish, for example;

wget https://git.kernel.org/torvalds/t/linux-6.6-rc5.tar.gz

This command will download the kernel to your current directory

Extract the kernel archive.

tar -xf linux-6.6-rc5.tar.gz

Go into the directory 

cd linux-6.6-rc5

Customise your kernel

make menuconfig

Once you have finished save and exit.       

Now it is time to build the kernel package.

time make -j $(($(nproc)+1)) bindeb-pkg

Depending on your processor this may take some time. When it has finished your kernel *.deb package will be in your home directory.

To install it,

sudo dpkg -i linux-image-6.6.0-rc5_6.6.0-rc5-4_amd64.deb

sudo dpkg -i linux-headers-6.6.0-rc5_6.6.0-rc5-4_amd64.deb

Then reboot and enjoy your newer kernel.

Notes

It is important you delete the 2x security keys specified by canonical, your kernel build will fail if you do not. These can be found under;

-*- Cryptographic API ---> Certificates for signature checking ---> (debian/canonical-certs.pem) Additional X.509 keys for default system keyring

-*- Cryptographic API ---> Certificates for signature checking ---> (debian/canonical-revoked-certs.pem) X.509 certificates to be preloaded into the system blacklist keyring

Additionally to speed up the build, disable debugging information

Kernel hacking --->  Compile-time checks and compiler options ---> Debug information (Disable debug information) ---> (X) Disable debug information

If you have an AMD Zen 3 processor you can use time make EXTRA_CFLAGS=-march=znver3 -j $(($(nproc)+1)) bindeb-pkg for extra performance optimizations.