How to install Ubuntu from ISO file?

Question

I located iso file on (hd0,gpt7)/iso/ubuntu-20.10-desktop-amd64.iso

On GRUB commandline, I typed like below.

set root=(hd0,gpt7)
set iso=/iso/ubuntu-20.10-desktop-amd64.iso
loopback l $iso
linux (l)/casper/vmlinuz root=casper iso-scan/filename=$iso
initrd (l)/casper/initrd
boot

Ubuntu booted. But could not installed Ubuntu with error. It took so many hours checking system.

Does this answer your question? Is checking disc necessary while booting Ubuntu from USB? — karel, Feb 21 '21 at 01:58
If it took that long to check the system, you would do well to verify the .iso. — KGIII, Feb 21 '21 at 02:19
You need to add the parameter toram at the end of the linux line if you want to install Ubuntu to a running system Then you will need to unmount isodevice before installing. sudo umount -lrf /isodevice. I will write out a proper answer for you. The procedure is similar to the instructions on this page: https://askubuntu.com/questions/855039/can-ubuntu-be-installed-to-the-pendrive-it-was-booted-from — C.S.Cameron, Feb 21 '21 at 03:35

score 4 · Answer 1 · answered Feb 21 '21 at 04:04

Installing Ubuntu to Internal HDD from ISO booted on the HDD

Your /boot/grub/grub.cfg file should have a menuentry similar to:

menuentry "isoname ISO" {
    set root=(hdX,Y)
    set isofile="/[path]/[name].iso"
        loopback loop $isofile
        linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile toram --
        initrd (loop)/casper/initrd
}

The toram item is critical.

Boot the computer selecting the above menuentry.

Unmount all partitions. To unmount the Live iso run:

sudo umount -lrf /isodevice

Confirm all partitions are unmounted. You should be running totally in RAM.

Run the Ubuntu installer. I generally use the Something else option.

You may want to run sudo update-grub on reboot.

How to install Ubuntu from ISO file?

1 Answers1

Installing Ubuntu to Internal HDD from ISO booted on the HDD

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