Turn off Intel Turbo boost in <= Ubuntu 20.04 Save laptop battery and power

Step 1 Install msr-tools 

 sudo apt-get install msr-tools 

Step 2 

 sudo modprobe msr  

Step 3 Check Intel turbo boost status 

 sudo rdmsr -pi 0x1a0 -f 38:38

1=disabled
0=enabled 
Replace i with your cores number example(-p2 for 2 core cpu)

Step 4  Open text editor copy paste following and save it as turbo-boost.sh

#!/bin/bash

if [[ -z $(which rdmsr) ]]; then
    echo "msr-tools is not installed. Run 'sudo apt-get install msr-tools' to install it." >&2
    exit 1
fi

if [[ ! -z $1 && $1 != "enable" && $1 != "disable" ]]; then
    echo "Invalid argument: $1" >&2
    echo ""
    echo "Usage: $(basename $0) [disable|enable]"
    exit 1
fi

cores=$(cat /proc/cpuinfo | grep processor | awk '{print $3}')
for core in $cores; do
    if [[ $1 == "disable" ]]; then
        sudo wrmsr -p${core} 0x1a0 0x4000850089
    fi
    if [[ $1 == "enable" ]]; then
        sudo wrmsr -p${core} 0x1a0 0x850089
    fi
    state=$(sudo rdmsr -p${core} 0x1a0 -f 38:38)
    if [[ $state -eq 1 ]]; then
        echo "core ${core}: disabled"
    else
        echo "core ${core}: enabled"
    fi
done 

Step 3

Go to save file and open terminal from there.

Step 4 Disable turbo boost by following command

sudo ./turbo-boost.sh disable

Watch in Youtube for guide

https://youtu.be/HRYFxU3glrA