"Boot Error" on live-usb flash drive with 15.10
According to the release notes at https://wiki.ubuntu.com/WilyWerewolf/ReleaseNotes you can't use usb-creator from lower version of Ubuntu ( including 15.04) to make live-usb of Ubuntu 15.10
Due to changes in syslinux, it is not currently possible to use usb-creator from 14.04 and earlier releases to write USB images for 15.04 or later; we believe that it is also not possible to use usb-creator from a 15.04 or later system to write USB images for earlier releases. For now the workaround is to use a matching release of Ubuntu to write the images, but we intend to issue updates soon to work around this incompatibility
You may still make it from 15.10 or from Windows(universal-usb-installer for example)
I tested usb-creator-gtk from ubuntu 15.10 in my virtualbox, it crashed at the end of the process! So we have to say NO to usb-creator-gtk! Tested with unetbootin 608-1 installed through USC, writing to usb succeeded but usb is not bootable!
However, I found away that worked perfectly inside ubuntu, even with older ubuntu version.
- Right click your
ubuntu-15.10-desktop-amd64.iso> Open with Disk Image writer - Choose your usb drive and click Start Restoring... and follow the instruction.
That usb is bootable without any error. After installing ubuntu, you will need to format that usb with gparted if you want to store data on that usb again.
It looks like the good old dd command works as well.
Just to be clear:
dd if=ubuntu-15.10-desktop-amd64.iso of=/dev/sdX bs=1M
where X is your USB drive identifier. Use b, c, d and not b1, so use the drive, not the eventual partition.
At least on my machines, that are Thinkpads T420 and W520, so not super-new it seems to boot using isolinux, so like a CD/DVD.
Some newer machine may have a different BIOS that doesn't allow that. EFI enters then in the discussion, but I'm not an EFI expert so let me close it here.
Verified also with 16.04.
I googled the error and it led me to a page where it mentioned something about a bug in Ubuntu 15.10. I quit trying to create it on my PC then went on to do the following.
Since my only PC with an OS was with Ubuntu 15.10 I had no other choice than to create a live USB from my android device to install Ubuntu on my new PC.
tl;dr There is a bug in 15.10. So I created a live USB using DriveDroid and successfully installed Ubuntu on my new PC.