latest kernel compile in ubuntu step by step

Q : How to Compile Kernel in Ubuntu 

Q : Latest Kernel Compilation step's in Ubuntu

Q : Atheros 5Ghz AP Channel Enable 

Q : Kernel Compile for Artheros Wifi Card to Allow 5Ghz Frequency on AP Mode

Step 1 

Install compulsory packages 

sudo apt-get update

sudo apt-get install linux-source fakeroot kernel-wedge build-essential
Step 2 

Install Dependency 

sudo apt-get install git-core libncurses5 libncurses5-dev libelf-dev asciidoc 

sudo apt-get install binutils-dev crash kexec-tools makedumpfile kernel-wedge 
     sudo apt-get install libssl-dev bc debhelper kernel-package libc6-dev

Step 3 

Download Kernel for kernel.org ( you can download latest kernel )

cd /usr/src 

wget ftp://ftp.kernel.org/pub/linux/kernel/v4.x/linux-4.8.4.tar.gz 

tar xvf linux-4.8.4.tar.gz
Optional Steps : 


It's Required a approx 30-60GB disk space, if you don't have just mount 

external disk by following steps, best to create directory with kernel name


mkdir /usr/src/linux-4.8.4

mount /dev/sdb2  /usr/src/linux-4.8.4
here /dev/sdb2 is external hdd, and extract tar on it


tar xvf linux-4.8.4.tar.gz -C /usr/src/linux-4.8.4/

Step 4 and 5, if you don’t need 5ghz access point channel for Atheros WIFI 

Card, avoid step 4 and 5 

Step 4 

Download Patch for wifi 5ghz frequency 

cd /usr/src/linux-4.8.4/drivers/net/wireless/ath/ 

wget --no-check- certificate https://dev.openwrt.org/export/32952/trunk/ 

package/mac80211/patches/403-ath_regd_optional.patch
Step 5 

Apply Patch

patch -Np5 -i 403-ath_regd_optional.patch 

echo "#define ATH_USER_REGD 1"|cat - regd.c > /tmp/out && mv /tmp/out regd.c 
 Step 6 

Create .config file and make oldconfig 

cd /usr/src/linux-4.8.4/ 

cp /boot/config-$(uname -r) .config 

make oldconfig

Note: choose default option just hit the enter on every prompt or choose according your need..

Step 7 

Compile, make and create .deb file

fakeroot make-kpkg --initrd --append-to-version=-linuxtopic kernel-image kernel-headers
OR

     fakeroot make -j5 deb-pkg LOCALVERSION=-linuxtopic KDEB_PKGVERSION=1

Note: Wait approx 1 to 10 hour 

Step 8 

check .deb and Install Kernel

ls ../*.deb 

dpkg -i ../*.deb