[Bug 1955611] Re: Unable to boot Live USB on Mac

[Chris Guiver]

You mention the media working on the virtual machine; was the virtual
machine reading the image on the thumb-drive? or just using the ISO on
disk or other media?

(if it was reading the ISO on different media; be it disk drive, network
share it doesn't discount my blaming media; if however you'd setup the
VM to boot from the same USB media - that is different I believe).

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Title:
  Unable to boot Live USB on Mac

Status in casper package in Ubuntu:
  New

Bug description:
  Live USB boot reaches grub but fails some time after and fails to
  completely boot on Macbook Pro 11,3 with Ubuntu 20.04.3

  After selecting 'Ubuntu' or 'Ubuntu with safe graphics' the splash
  screen shows, and after a while the screen is filled with lines of
  `/init: line 49: can't open /dev/sdb: No medium found` with one line
  at the bottom of `Unable to find a medium container a live file
  system. Attempt interactive netboot from a URL?`

  Booting with debug option from grub does not give keyboard access. I
  have attached a photograph of the output at boot time to this ticket
  as extracting logs from the system does not seem possible.

  Full hardware specs of the exact model can be found here:
  https://everymac.com/systems/apple/macbook_pro/specs/macbook-pro-
  core-i7-2.5-15-dual-graphics-mid-2014-retina-display-specs.html

  The iso file used is ubuntu-20.04.3-desktop-amd64.iso

  The SHA256 of the downloaded iso file and MD5 sum of all files on the USB using the included md5um.txt have been confirmed OK.
  All USB ports on the machine, and multiple USB devices have been tested.
  The Live USB install boots to Ubuntu desktop when run from within a virtual machine under VMWare Player 16.

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