How to Install chromeOS - Flex Dual boot or Multiple boot in Single Hardisk or SSD

So far there have been many articles or video tutorials how to install chromeOS in PC or laptop, it single boot, dual boot and multiple boot,  but very little or even none write tutorial How to Install chromeOS - Flex dual boot or multiple boot in single hard disk or SSD. 

Okey let we start the tutorial:

TOOLS WE NEED :

1. UFD (USB Flash Drive) minimum 16 GB
2. Fast and stable internet network
3. Laptop or PC installed with Linux or Windows

HARDWARE SUPPORTED:

1. Processor with architecture x86_64
2. Computer with UEFI BIOS. LEGACY BIOS is NOT SUPPORTED 

PREPARE INSTALLATION

1. Download newest file  Linuxloops live from original source GitHub, file in format .7z, when I write this article, newest version is 20250126, here the download link
2. After file linuxloops_live_20250126.7z  downloaded. extract it
3. then we create bootable UFD (minimum 16 GB) you can use Rufus or balena etcher to flash Linuxloops live  to UFD and wait until finish

INSTALLATION PROCESS

• Enter BIOS menu, set boot priority to USB Flash Drive, then save and restart

linuxloops live desktop preview

• Don't forget to connect internet, by clicking the wifi icon on the right corner bottom
• Then open gparted application, to make a partition for install chromeOS - Flex. 
• In this case, I create 50 GB partition with ext4 format, with name of partition /dev/sda8 (you can see the name of partition on gparted app in the leftmost column) 

gparted application

• Then open terminal linux

• Type command

mkdir -p ~/tmpmount 

•  Then

 sudo mount (nama partisi anda) ~/tmpmoumt

•  Because my partition name /dev/sda8 so 

 sudo mount /dev/sda8 ~/tmpmoumt

• Then open linuxloops installer in left top corner, wait a bit longger
• Then choose chromeOS-Flex

DISTRO YOU CAN CHOICE

• Choose stable
• Choose image
• Then set the size for install image chromeOS-Flex (I set in max size)

• Then choose the location image file in the directory we made before: /home/live/tmpmount
• Then you can click next, this process take very long time, depend of your internet speed downloading image OS, you can wait with make a cup of coffee 🤣
• Wait with patient untill all process is clear. 
• When all process clear you can saw command like this:

sudo cat /etc/grub.d/40_custom /home/live/tmpmount/ChromeOS-Flex.img.grub.txt | sudo tee /etc/grub.d/99_linuxloops_chromeos-flex; sudo chmod 0755 /etc/grub.d/99_linuxloops_chromeos-flex; sudo grub-mkconfig -o /boot/grub/grub.cfg

• Copy that command and save in format .txt with application text editor, you will need it, while you setting boot menu in grub,

MAKE BOOT PROCESS

Because in my laptop was installed Linux Mint and Windows 10. I will use Linux Mint to make boot 

• Open terminal in Linux Mint
• Type command 

mkdir -p ~/tmpmount 

• Then

sudo mount /dev/sda8 ~/tmpmoumt

• Then you can open .txt  file, you saved before and edit text /home/live/tmpmount/ChromeOS-Flex.img.grub.txt
• Change live become your user name linux, because my user name AI so /home/AI/tmpmount/ChromeOS-Flex.img.grub.txt
• then copy that command to terminal

sudo cat /etc/grub.d/40_custom /home/AI/tmpmount/ChromeOS-Flex.img.grub.txt | sudo tee /etc/grub.d/99_linuxloops_chromeos-flex; sudo chmod 0755 /etc/grub.d/99_linuxloops_chromeos-flex; sudo grub-mkconfig -o /boot/grub/grub.cfg

• then type

sudo update-grub

• then type reboot 

grub boot menu preview

 THEN HOW TO MAKE BOOT IF USE WINDOWS

• You can download grub2win
• Then you can add new boot entry, with open file ChromeOS-Flex.img.grub.txt  this file location on chromeOS - Flex partition (in my laptop sda8)

Contents chromeOS - Flex partition (sda8)

• Then copy all content that file, and paste in new entry boot on  grub2win
• Restart

That is the process of installation chromeOS - Flex dual boot or multiple boot, if you have more questions, you can write in comment, Thank You