[Bug 1925010] Re: shim-signed 15.4 does not boot on EFI 1.10 systems

[andschuster]

So the question remains, when the normal upgrade path from 20.10 to
21.04, that was stopped because of this bug, will be available.

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https://bugs.launchpad.net/bugs/1925010

Title:
  shim-signed 15.4 does not boot on EFI 1.10 systems

Status in shim package in Ubuntu:
  Fix Released
Status in shim-signed package in Ubuntu:
  Confirmed
Status in shim source package in Hirsute:
  In Progress
Status in shim-signed source package in Hirsute:
  In Progress

Bug description:
  The latest update on Hirsute made the MacBook Air from 2012
  unbootable.

  It could be recovered by booting a 20.04 live CD, downloading 20.04's
  shim package and overwriting the files in EFI/ubuntu and EFI/BOOT with
  the files shipped in the shim package.

  Machines Affected (not comprehensive):
  MacBookPro8,2
  MacBookAir5,2

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