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How can I create an ISO from unetbootin to then burn a DVD?

unetbootin

It looks convenient that the files are already there. Can they be packaged up as an ISO instead of re-downloading? (This is from plain vanilla Ubuntu, using unetbootin.)

see also:

https://superuser.com/questions/777339/where-does-unetbootin-put-the-downloaded-iso-files

so, maybe the ISO files are there for the taking. Hmmmm....I will look:

thufir@dur:~$ 
thufir@dur:~$ locate -i "*.iso" 
/home/thufir/Desktop/ubuntu-18.04-live-server-amd64.iso
/home/thufir/Downloads/lubuntu-18.04-desktop-amd64.iso
/home/thufir/Downloads/ubuntu-18.04-desktop-amd64.iso
/home/thufir/Downloads/xenialpup64-7.5-uefi.iso
/usr/lib/memtest86+/memtest86+.iso
thufir@dur:~$
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3 Answers 3

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The Ubuntu 18.04 ISO file can be downloaded from the official Download Ubuntu Desktop webpage or from the terminal using the following command:

wget -c http://releases.ubuntu.com/18.04/ubuntu-18.04-desktop-amd64.iso

The name of the official Ubuntu ISO file is ubuntu-18.04-desktop-amd64.iso. I prefer using wget to download the Ubuntu ISO file because it automatically resumes interrupted downloads from the same place when the download was interrupted, so you never need to download anything twice if there is a temporary glitch in internet connectivity.

Maybe 18.04_Live_x64 is an ISO file already, and you can rename it to 18.04_Live_x64.iso and then burn a DVD. To avoid wasting a DVD, try renaming it to 18.04_Live_x64.iso and then making a bootable Ubuntu 18.04 live USB flash drive using the built-in Startup Disk Creator application. If the Ubuntu 18.04 live USB flash drive boots successfully then it's OK to either burn a DVD from 18.04_Live_x64.iso with the Brasero DVD burner application or else use the Ubuntu 18.04 live USB flash drive to install Ubuntu 18.04.

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  • yeah, but where is the file? Presumably there's an ISO somewhere...
    – Thufir
    Jul 11, 2018 at 6:53
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    @Thufir It's at http://releases.ubuntu.com/18.04/ and the ISO is named ubuntu-18.04-desktop-amd64.iso. If you wget it, wherever it ends up is wherever you target it to be. Not specifying a target will probably drop it in the current folder.
    – Mast
    Jul 11, 2018 at 11:16
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No, if I understand correctly, Unetbootin can not burn a DVD, and I don't think it will unpack an iso file. (Maybe Unetbootin stores a temporary copy in the /tmp directory, that you could use for that purpose, but it would be better to get and use an iso file the regular way.)

You should use other tools for that purpose:

  • Download an iso file of Ubuntu or an Ubuntu community flavour and check (for example with md5sum) that it was downloaded correctly.

  • Use a burning tool, for example k3b and 'burn an iso file' with the slowest possible speed. It is a good idea to verify the burning process.

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    Yes, the question should be: where is that temporary copy? (Slow internet connection.)
    – Thufir
    Jul 11, 2018 at 6:58
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    Yes @Thufir, storing in /tmp is a standard way in linux. You could try sudo find /tmp -name "*.iso*" -- Locate might not have an update data base, or might skip /tmp.
    – sudodus
    Jul 11, 2018 at 6:58
  • @Thufir, Fixing typing error: Locate might not have an updated data base, or might skip /tmp. It is also possible that the iso file is stored under another name, so you should look for files with the correct size. It is also possible, the Unetbootin removes the temporary file at exit. At reboot and shutdown/cold boot, /tmp will be cleared, and all files and directories there will be lost.
    – sudodus
    Jul 11, 2018 at 7:12
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    I did a few searches, no joy. Please don't waste more time on this on my account. Thanks to everyone.
    – Thufir
    Jul 11, 2018 at 7:14
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UNetbootin extracts an operating system ISO to USB and provides syslinux as a boot loader.

A program like Remastersys, (discontinued), or ISO respin, http://linuxiumcomau.blogspot.com/2017/09/new-version-of-iso-respin-script.html or Pinguy Builder, https://pinguyos.com/2015/09/pinguy-builder-an-app-to-backupremix-buntu/, may be used to put the files back into a bootable ISO.

Alternately you can use dd to turn the USB contents into an image file:

dd if=/dev/sdx of=~/usb2img.img

where sdx is the device id of the bootable USB.

The image file can be written to a USB drive using mkusb in Ubuntu https://help.ubuntu.com/community/mkusb and Win32 Disk Imager in Windows, https://sourceforge.net/projects/win32diskimager/, (or dd in Ubuntu, if desired).

  • The new USB will be a duplicate of the original including UUID. GParted can be used to give the partitions unique UUID's if needed.

  • If you used UNetbootin's persistence feature, you can add programs, and customize the OS before writing to image, Max 4GB+4GB persistence.

  • The latest version of UNetbootin makes a drive bootable with BIOS or UEFI.

  • An .img file will compress for transport, (compression speed seems slow).

  • You can burn the .img file to CD or DVD using Brasero.

Caution: Do not make any mistakes while using dd, your HDD's may be at risk.

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