> However, a change has been made to ubuntu-release-upgrader that lets us
> block upgrades only for Apple hardware, and upgrades have been turned on for
> 20.10 to 21.04. So I'm not sure why you say that it "currently prevents"
> it.

What I meant by "[this bug] currently prevents do-release-upgrade to
21.04 from 20.10" is:

If, as I write this, on a (non-Apple) ppc64el platform running 20.10,
one attempts to use "do-release-upgrade" to upgrade to 21.04, the
upgrade will not proceed, and instead this message will appear:

> An upgrade is not possible at this time
> 
> Due to a bug in shim, LP: #1928434, upgrades are not currently safe
> for your hardware.
> 
> Once that bug has been resolved you will be able to upgrade to the
> next release of Ubuntu.
> 
> 
> Restoring original system state
> 
> Aborting

Does that answer your question?

In case it helps:

1) the "shim" package is _not_ installed on this system (which I guess
isn't surprising, given that it doesn't use any of EFI, UEFI, grub etc.
to boot...)

2) I believe I have the latest version of ubuntu-release-upgrader, my
system reports:

# ubuntu-release-upgrader-core is already the newest version
(1:20.10.12)

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https://bugs.launchpad.net/bugs/1928434

Title:
  shim-signed does not boot on EFI 2.40 by Apple

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