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

[Steve Langasek]

> Yes, and why can't we use the old binaries that worked before?

That's exactly what we're recommending you do by not upgrading to Ubuntu
21.04 until a newer fixed version is available.

We did not roll back shim in hirsute to the previous version because
that version is expected to be revoked by Microsoft during the life
cycle of Ubuntu 21.04.

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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:
  Confirmed
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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