This has proved to be a very frustrating bug and I worry that less
knowledgeable and persistent users will encounter the same situation and
give ubuntu a bad name. After all, EFI is here to stay and we all want
ubuntu to used more widely with each new release. 16.04 is to be the
next LTS and my short experience with both betas has convinced me that
it is a huge improvement over 14.04.
The good news it that I have installed 16.04 beta2 on the Asus T300 chi
transformer notebook. I will write more about this later. The bad news
is that I found it impossible to install directly from a usb.
The internet is littered with dead-ends, bad advice and out-of-date
instructions when dealing with the initramfs message "unable to find a
medium containing a live file system"... and not just for ubuntu.
In my case (and perhaps many others), I found the message was issued by
the script casper, when ${livefs_root} has not been set by the function
mountroot(). This function calls find_livefs(), which is also in the
casper script. I even tried setting the casper kernel boot parameter
ignore_uuid in grub.cfg, but the message was still generated. I then
deleted the quiet boot option and changed splash to nosplash. Now I
could see the console log as it was generated.
My problem determination was made much more difficult by the fact that
busybox would not read from my keyboard (PS/2 into a USB dongle).
Eventually, I tried popping the keyboard dongle out and back into the
USB hub port - the log showed the device was recognised and then I could
enter commands to see what was going on!
Most importantly, the ubuntu live iso usb device was NOT mounted at the
time casper had given up looking for the live filesystem.squashfs. No
wonder it gave up!
I spent a long time messing around - trying different manufacturers usb
sticks, manually mounting the device on /cdrom, pre-unsquashing the live
system, and even trying to satisfy the unsquashed symlinks for
/initrd.img and /vmlinuz. Nothing worked because I was unable to find a
way to resume initialisation of the final stage of the bootstrap
process. (Perhaps someone more knowledgeable could tell me?)
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https://bugs.launchpad.net/bugs/1557894
Title:
Strange usb device format and failure to boot on UEFI system
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