Compiling Kernel from Upstream Sources

(Please excuse the formatting, it was originally written in Markdown and then converted to BBCode)

Environment Setup

Based on and extended from the Official Ubuntu Documentation.

Setup Build Environment

Pull Kernel Sources

export KERNEL_FULL_VERSION=$(uname -r)
export KERNEL_VERSION=$(uname -r | cut -d - -f1)
sudo apt-get build-dep linux-image-`uname -r`
sudo apt -y install linux-source-$KERNEL_VERSION
Copy Sources to Build Directory

mkdir -p ~/kernel && cd ~/kernel
tar xjvf /usr/src/linux-source-$KERNEL_VERSION.tar.bz2
cd linux-source-$KERNEL_VERSION

Configure Permissions

sudo chmod a+x /usr/src/linux-source-$KERNEL_VERSION/debian/scripts/*
sudo chmod a+x /usr/src/linux-source-$KERNEL_VERSION/debian/scripts/misc/*

Copy Config

if [ -f "/boot/config-$KERNEL_FULL_VERSION" ]; then
 cp -vi /boot/config-$KERNEL_FULL_VERSION .config
else
 echo "Warning: /boot/config-$KERNEL_FULL_VERSION not found. Using default configuration."
fi

sed -i -e '/CONFIG_SYSTEM_TRUSTED_KEYS=/ s/=.*/=""/' .config
sed -i -e '/CONFIG_SYSTEM_REVOCATION_KEYS=/ s/=.*/=""/' .config

Pull Dependencies

sudo apt-get install rsync libncurses5 libncurses5-dev pahole

Configure and Build Kernel

Prepare Env

cd /usr/src/linux-source-$KERNEL_VERSION

sudo fakeroot debian/rules clean

# quicker build:
sudo fakeroot debian/rules binary-headers binary-generic binary-perarch

Build .deb Packages for Kernel

At this point, you should be able to configure the kernel in the way most comfortable for you.

Refer to the kernel.org Documentation on configuration editing.

After configured, run the following:

cd ~/kernel/linux-source-$KERNEL_VERSION
make -j3 bindeb-pkg

References

* kernel.org Documentation
* Official Ubuntu Documentation