[Bug 1853022] Re: shim-signed package can not be configured on Lenovo Yoga C630 WOS

[RussianNeuroMancer]

Isn't these ARM laptops is only aarch64 devices that need signed shim to
boot with enabled Secure Boot? Maybe it's make sense to modify shim-
signed package to not fail if UEFI variable can not be modified and
throw warning message instead?

I propose this because AFAIK this "UEFI variable writing" issue is not
going anywhere anytime soon, and current version of the script prevent
regular distribution upgrades because shim-signed package
installation/upgrade will always fail.

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https://bugs.launchpad.net/bugs/1853022

Title:
  shim-signed package can not be configured on Lenovo Yoga C630 WOS

Status in grub2 package in Ubuntu:
  New
Status in shim package in Ubuntu:
  New

Bug description:
  Hello!

  Besides issue with shim itself described in Bug 1849863 I noticed that
  there is also issue with shim-signed package installation script.
  Attempt to install shim-signed on Lenovo Yoga C630 WOS cause following
  errors and left shim-signed package in unconfigured state, which will
  cause more issues later on (for instance update-manager will always
  try configure shim-signed on every upgrade).

  Installing for arm64-efi platform.
  grub-install: warning: Cannot set EFI variable Boot0000.
  grub-install: warning: efivarfs_set_variable: writing to fd 7 failed: Invalid argument.
  grub-install: warning: efivarfs_set_variable: failed to unlink /sys/firmware/efi/efivars/Boot0000-8be4df61-93ca-11d2-aa0d-00e098032b8c: Invalid argument.
  grub-install: warning: _efi_set_variable_mode: ops->set_variable() failed: Invalid argument.
  grub-install: error: failed to register the EFI boot entry: Invalid argument.
  dpkg: error processing package shim-signed (--configure):
   installed shim-signed package post-installation script subprocess returned error exit status 1
  Processing triggers for man-db (2.8.7-3) ...
  Errors were encountered while processing:
   shim-signed
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  Setting up shim-signed (1.39+15+1533136590.3beb971-0ubuntu1) ...

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