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How can I (re)install Ubuntu from within Ubuntu?

I am running Ubuntu 12.04, and I have a Ubuntu 13.04 on a USB drive.

I want to format my hard drive and install Ubuntu 13.04. I don't have a CD, and my computer won't boot from USB.

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You can use GRUB like in my answer here: superuser.com/questions/558959/… –  gronostaj Jul 1 '13 at 10:47

2 Answers 2

From AskUbuntu:

To upgrade from Ubuntu 12.10 on a desktop system:

  • Open Software Sources.
  • Switch to the Updates tab and set Notify me of a new Ubuntu version to For any new version.
  • Press Alt+F2 and type in "update-manager -d" (without the quotes) into the command box.
  • Update Manager should open up and tell you: New distribution release '13.04' is available.
  • Click Upgrade and follow the on-screen instructions.

No need for USB device. However, if you don't have internet connection it won't work.

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Does that allow me to format, or is that just an upgrade? –  Petah Jul 1 '13 at 10:23
    
I am not sure, but it makes sense that it will ask you if you want to format. Actually I have dual-boot laptop with Ubuntu 12.04, so I will check this now. –  matan129 Jul 1 '13 at 10:26
    
Also, have you tried changing the boot order via the boot menu? it should let you boot from USB. –  matan129 Jul 1 '13 at 10:35
    
Yea I tried changing the boot order, there was a "Removable Media" option, but it didn't work. –  Petah Jul 1 '13 at 12:22
    
Can you determine your motherboard model and write it here? By the way, Ubuntu Upgrade doesn't have the option of formatting, I've checked. –  matan129 Jul 1 '13 at 12:28

You won't be able to do a format and install without booting from some external device.

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Can I not make Ubuntu boot from the USB? or Grub maybe? –  Petah Jul 1 '13 at 10:23
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Booting from USB will be a bios option in your PC, it won't be anything to do with the operating system you're trying to boot into. –  Simkill Jul 1 '13 at 10:36

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