Inukaze - Dummy method to clean root partion

Inukaze : This its my own , an easy method
To clean a "/" (root) partition of linux filesystem
except the "/home" directory / partition to install
 a new linux distro without troubles and clean installation

its simple , just config you BIOS or use "BootMenu"
in somes PCS activate when you press "F8" at boot
and select "CD-ROM"/"USB"/"SD" depend of case

Now start your "live"/CD/SD/USB and now use the
"Terminal" with the command "sudo blkid" if a debian
or debian derivate distro

with anothers distro you try with "su blkid" or first
login how root , using "sudo su"

now , if you know what partition you need mount
( i ever make a "LABEL" for each partition i can )
in a directory , for example you can make a folder

cd $HOME/Desktop
sudo mkdir -p Distro

For example :
sudo mount /dev/sda2 Distro

and now use :
sudo rm -rf bin boot cdrom DebBoot dev etclib lib64 lost+found media mnt opt proc root run sbin selinux srv sys tmp usr var xfce4

and now
cd ..
sudo umount Distro

Now you can use the installer in your Live Distro , to install , without format the partition

if you are trying to install old version of "Ubuntu" for Example "Jaunty Jackalope"
and in the end of installation "grub-install" fail , you must do the follow for example

#  - Partitions "/dev/sda2" ( root partition ) , "/dev/sda4" ( Boot partition ) :

mkdir Linux
sudo mount /dev/sda2 Linux/
sudo mount /dev/sda4 Linux/boot/
sudo mount --bind /proc Linux/proc
sudo mount --bind /dev Linux/dev
sudo mount --bind /sys Linux/sys
sudo chroot Linux/

grub-install --recheck /dev/sda
grub-update

Ready. ( if dont work , try with "grub-install --recheck /dev/sda4 && grub-update )