Boot Clonezilla ISO from GRUB2 Menu

1. Put Clonezilla ISO file in root / directory.

2. Open the terminal and run:

   sudo nano /etc/grub.d/40_custom
   

3. Insert the following text at the end of the file:

   menuentry "Clonezilla Live" {
    set isofile="/clonezilla-live-2.2.3-10-amd64.iso"
   loopback loop (hd0,1)$isofile
   linux (loop)/live/vmlinuz boot=live live-config nolocales edd=on nomodeset
   ocs_live_run=\"ocs-live-general\" ocs_live_extra_param=\"\"   ocs_live_keymap=\"\" ocs_live_batch=\"no\" ocs_lang=\"\" vga=788   ip=frommedia nosplash toram=filesystem.squashfs findiso=$isofile
   initrd (loop)/live/initrd.img
   }
   

4. Save file, exit and open GRUB's config file:

   sudo nano /etc/default/grub
   

Comment out the line GRUB_HIDDEN_TIMEOUT=0 so it looks like:

#GRUB_HIDDEN_TIMEOUT=0

Make sure that the line GRUB_TIMEOUT=[some number] has a number >0, for example, 10

5. Save file and exit and run

   sudo update-grub2
   

ADDITIONAL NOTES:

⠀- /clonezilla-live-2.2.3.10-amd64.iso -- change the name of iso file to match the one you have.

⠀- (hd0,1) may be different for you depending on how you installed Ubuntu.

(hdX,Y) X = hard drive #, Y = partition.

⠀You can also see my YouTube video for the above procedure: Boot Clonezilla ISO from Grub2 Menu.

I tried the solution provided by JJ Avila but modification in /etc/grub.d/40_custom didn't worked for me. This what i've done.

1. Copy clonezilla iso to / (root) directory

   sudo cp /path/to/your_clonezilla_iso /

2. Run sudo gedit /etc/grub.d/40_custom

EDIT:

menuentry "Clonezilla live" {
set isofile="/clonezilla-live-20160503-xenial-i386.iso"
loopback loop $isofile
linux (loop)/live/vmlinuz boot=live union=overlay username=user config components quiet noswap nolocales edd=on nomodeset nodmraid ocs_live_run=\"ocs-live-general\" ocs_live_extra_param=\"\" keyboard-layouts= ocs_live_batch=\"no\" locales= vga=788 ip=frommedia nosplash toram=filesystem.squashfs findiso=$isofile
initrd (loop)/live/initrd.img
} 

save & exit.

3. Run sudo update-grub2

NOTE: iso in root directory that's why

set isofile="/clonezilla-live-20160503-xenial-i386.iso" 

(Here change name of your iso)

REFERENCE: Clonezilla Live on Hard Drive