linux install kernel

• System
• Compile
• Install
• Boot
• Change kernel version

System

• OS: Ubuntu 18.04 (64bit)
• Current kernel: 5.3.0-42-generic

Compile

• Change directory to /usr/src.
• Get kernel source code with the following command (ver.5.4.1).

wget https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/linux-5.4.1.tar.gz

• Decompress with tar.

tar -xvf linux-5.4.1.tar.gz

• Change directory to linux-5.4.1.
• Before compiling you have to install some packages via apt. Run the following command.

sudo apt install flex bison libssl-dev libelf-dev

• Make .config with the following command.

make olddefconfig

• Compile with the following command. 4 indicate how many thread do you use.

make -j 4

Install

• Install modules and kernel image with the following command.

make modules_install && make install

Boot

• Setting bootloader (grub).

grub-mkconfig

• Reboot.

Change kernel version

• You can choose kernel by selecting Advanced options for Ubuntu.
• You can also change default kernel by editing /etc/default/grub.

GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux x.x.x"