I want to use boot-repair-disk on my pc. This is a program that is previously burned in a removable media such as CD/DVD/USB stick, and then you boot on it (power off the computer, press the BIOS menu and select the media to boot from there).
Justification Why I need this program to boot: It's a recommended tool for fixing problems of booting, for recovering the system, and for uninstalling OS Ubuntu (what I want to do) it's the recommended way. By the way, Ubuntu it's totally corrupted, I can't boot in it and uninstall from it, because it crashes and the only way out is removing the battery, Ubuntu got corrupted during a update error.
So the situation is this: I downloaded iso for Boot repair disk 64, which is linked in the Ubuntu article from before, and in that article it very clearly says can be written in usb sticks, and also in this instructions from above. I'm insisting on this point because the program is called boot repair disk but of course that's only the name.
I wrote that image into usb-sticks three times with different burners and into two different usb sticks, in all attempts followed this procedure, wich has worked other times with different images (that were Ubuntu 14.04 LTS 64 bit and Debian Jessie 8 64bit), the procedure which is the normal one is: Powering off, inserting usb stick, power on, change boot order to give priority to usb stick, and save changes. And the it boots from the hard drive into the normal GRUB2, like it couldn't boot from usb stick and resorts to the next option, wich is the Hard drive. So I can't use the program. There is not any text or log showing any error or failure, it just ignores it.
I tried burning from Windows with Win32 disk imager and Unetbotin, and from Linux (debian) with command line way, like this (has worked fine before)
For some reason I can't boot from this one. I think maybe it's not a hybrid ISO image, but I don't have sufficient knowledge about that... But I did saw this question, and did the first answer recommendation and in fact it seems like this image wasn't recognized the same way as another one (the Ubuntu one). The Ubuntu one displayed a big output with many options, the image I want to boot displayed a error.
Edit: I forgot to say that it actually boots from a cd r, written with brasero on linux debian. But I still have reasons for wanting it from usb stick, one of them it's slow and cd it's scratched, so it may crash, wich is dangerous because it's a session live from a cd, the only way out is removing power ( the batterie).