First I zeroed out the entire USB flash drive:

dd if=/dev/zero of=/dev/sdb

And then I used fdisk(8) to create a type c W95 FAT32 (LBA) partition on it and formatted the partition as FAT32:

mkfs -t vfat /dev/sdb1

And then I used Ubuntu Startup Disk Creator to make it a bootable Ubuntu USB stick (the .iso file is verified and not at fault). However, whenever I use the drive to boot I get a Boot error message. What's going wrong? How to fix this? Edit: No other distributions (Fedora, Debian, etc.) on other bootable USB disk creators (UnetBootin, etc.) work. The tool runs on Ubuntu 15.10; the file used is of Ubuntu 15.10.

  • Version 15.10? (I just recently came across a bug for this, I can dig out the bug report and I think there's a fix in there but I should probably make sure it's 15.10 that you're using, first.) – KGIII Nov 15 '15 at 12:56
  • @KGIII Yes, this is on 15.10 – ThePiercingPrince Nov 15 '15 at 13:12
  • Looks to be in triage status. Even though it says 'beta' in the description - it appears to have made it through. Check here and specifically response #23. – KGIII Nov 15 '15 at 13:31

Ubuntu Startup Disk Creator is sometimes buggy. Use dd command instead.

sudo umount /dev/sdb1
sudo dd if=/path/to/ubuntu.iso of=/dev/sdb bs=4M; sync

Wait for it to write to the device. That's it. Here bs refers to Byte Size

  • 1
    formatting the first partition to vfat beforehand is completely useless, since you overwrite the whole device with dd. – user1514631 Dec 23 '15 at 16:44
  • can also create bootable usb without bs=4M; sync in above command. this is not compulsory... it is worked in my case . – d a i s y Jan 1 '16 at 4:14
  • 1
    @Linux yup. but bs speeds things up – Gayan Weerakutti May 15 '16 at 14:36
  • I prefer add status=process at the end of command : sudo dd if=pat_to_.iso of=/dev/sdb bs=4M status=progress – vanduc1102 Dec 3 '16 at 17:14

Use built-in Disks tool (gnome-disk-utility) to create the Ubuntu installation media properly.

Open Disks - select Restore Disk Image from the menu on the top right.

Choose the ISO file and the USB drive to write it to and start restoring.

  • My computer uses BIOS. I have tried this. Every time I plug the USB drive in and boot, it's stuck on the BIOS POST screen. – ThePiercingPrince Nov 15 '15 at 13:59
  • @ThePiercingPrince : Every computer has a Basic Input Output System - Did you change the boot order to boot from USB ? - Did you try another USB drive ? :) – cl-netbox Nov 15 '15 at 14:02
  • Yes, I have tried another USB drive. I can't go into the BIOS settings, the computer is stuck. – ThePiercingPrince Nov 15 '15 at 14:05
  • @ThePiercingPrince : On many machines you can select where to boot from by pressing one of the F keys e.g. F8 or F10 or F12- please try this. :) – cl-netbox Nov 15 '15 at 14:09
  • I have tried that, my computer's boot menu key is normally ESC. This is what happens on my computer when I try to boot from the created USB key: 1. I plug the USB drive into the USB port, and then turn on the computer. 2. After a beep, the BIOS screen shows. I tried all keys, including ESC, F8, F12 and others but nothing happens. If I leave the computer on it's own, the BIOS screen just stays there, forever. This doesn't happen without the USB drive. – ThePiercingPrince Nov 15 '15 at 14:12

You have formatted it from FAT32 and FAT32 is only for Windows/MS-DOS booting and not Ubuntu, so zero it again but choose EXT3/4 and make the Ubuntu Startup Disk again and boot from USB.

  • 5
    This isn't right. Formatting fat32 is correct – Zanna May 15 '16 at 14:46
  • 1
    @Zanna is right as always :) – WinEunuuchs2Unix Jan 1 '17 at 20:45

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