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[Launchpad Bug Tracker <1931136@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package shim - 15.4-0ubuntu7

---------------
shim (15.4-0ubuntu7) hirsute; urgency=medium

  * Fix load option parsing, and thus fwupd execution (LP: #1929471) (PR #379)
  * Fix occasional crashes in _relocate() on arm64 (LP: #1928010) (PR #383)
  * Fix accidental deletion of RT variables (LP: #1934506) (PR #387)
  * mok: relax the maximum variable size check (LP: #1934780) (PR #369)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Wed, 07 Jul 2021 10:57:35
+0200

** Changed in: shim (Ubuntu Focal)
       Status: Fix Committed => Fix Released

** Changed in: shim-signed (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1931136

Title:
  Don't unhook ExitBootServices() when EBS protection is disabled

Status in shim package in Ubuntu:
  Fix Released
Status in shim-signed package in Ubuntu:
  Fix Released
Status in shim source package in Xenial:
  Fix Committed
Status in shim-signed source package in Xenial:
  Fix Committed
Status in shim-signed source package in Bionic:
  Fix Committed
Status in shim source package in Focal:
  Fix Released
Status in shim-signed source package in Focal:
  Fix Released
Status in shim source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  This is a regression in shim 15.4 that causes a crash in shim when chainbooting.

  Also, the machine resets when you exit grub, rather than going back to
  the EFI shell when launched from it.

  [Test plan]

  Boot an Ubuntu hirsute image in Secure Boot mode. While this issue was
  originally seen while chainbooting in
  https://github.com/lxc/lxd/issues/8770 - it was shown to be also
  reproducible just by booting a hirsute instance.

  [Where problems could occur]
  In exiting shim, failure to boot, etc.

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