Ubuntu – How to install Ubuntu from ISO file


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

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

Best Answer

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.

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