[Bug 1891718] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for efivar has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
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the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
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https://bugs.launchpad.net/bugs/1891718

Title:
  [Regression] breaks GRUB install on an nvme device

Status in Efivar:
  New
Status in efivar package in Ubuntu:
  Fix Released
Status in efivar source package in Focal:
  Fix Released
Status in efivar source package in Groovy:
  Fix Released

Bug description:
  [Impact]
  Grub fails to install on systems with nvme-subsys storage when installing focal, or upgrading from bionic to focal. As symptom of the latter is shown below:

  ┌───────────────────────┤ Configuring shim-signed ├────────────────────────┐
    │                                                                          │
    │ GRUB failed to install to the following devices:                         │
    │                                                                          │
    │ /dev/nvme0n1p1                                                           │
    │                                                                          │
    │ Do you want to continue anyway? If you do, your computer may not start   │
    │ up properly.                                                             │
    │                                                                          │
    │ Writing GRUB to boot device failed - continue?                           │
    │                                                                          │
    │                    <Yes>                       <No>

  I've hit this on 2 systems so far - a high-end Nvidia server and an
  older ARM Server.

  [Test Case]
  On a system with an EFI System Partition residing on an nvme-subsys block device, run grub-install:

  $ sudo /usr/sbin/grub-install
  Installing for x86_64-efi platform.
  /usr/sbin/grub-install: warning: Internal error.
  /usr/sbin/grub-install: error: failed to register the EFI boot entry: Operation not permitted.

  Also, regression test on a system with a non-nvme-subsys NVMe device.

  [Regression Potential]
  There's a risk that a parsing bug will introduce a regression to other systems - most at risk are systems with NVMe block devices. Supposedly nvme-fabrics systems were not previously supported and, as a side-effect of this backport, will now be. However, it's possible - like was the case with bionic/nvme-subsys - that nvme-fabrics *used* to happen to work, and now will work differently or even break. Ideally we'd be able to test on such a system, but I don't know where to find that hardware.

  This fix has been in groovy since just after beta (minus an innocuous
  debug statement that upstream requested during review), and the same
  patches apply cleanly to focal, which should help mitigate the risk by
  way of some real world exposure.

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