[Bug 1695666] Re: users shoot themselves in the foot by removing /boot/efi from /etc/fstab; u-r-u should warn and refuse to let them upgrade

[Ubuntu Foundations Team Bug Bot]

** Tags added: patch

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https://bugs.launchpad.net/bugs/1695666

Title:
  users shoot themselves in the foot by removing /boot/efi from
  /etc/fstab; u-r-u should warn and refuse to let them upgrade

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader source package in Artful:
  Fix Committed

Bug description:
  We currently have 6 open bug reports at
  <https://bugs.launchpad.net/ubuntu/+source/shim-signed>, and several
  closed ones, from users who have by one means or another gotten
  /boot/efi unmounted on their systems and then tried to apply updates.

  On a UEFI system, /boot/efi must be a separate mount point (it's the
  EFI System Partition); and it must be mounted at the time of upgrading
  the shim-signed/grub-efi-amd64 packages, because it's meaningless to
  "upgrade" these packages without installing the new bootloader to the
  ESP - if you don't want to use the Ubuntu UEFI bootloader, uninstall
  the package.

  However, a surprising number of users (i.e., more than 0) are leaving
  /boot/efi unmounted on their systems, and as a result get upgrade
  failures.  This is a bad thing to have happen in the middle of a dist-
  upgrade between releases.

  I think u-r-u should detect the case where either of the shim-signed
  and grub-efi-amd64 packages are installed, and /boot/efi is not in a
  sane state (is mountpoint + is mounted rw), and refuse to let the user
  start the upgrade until this is resolved.

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