[Bug 1087501] Re: Unable to boot unsigned kernel, boot freezes in shim call

[Launchpad Bug Tracker]

This bug was fixed in the package shim - 0.4-0ubuntu4

---------------
shim (0.4-0ubuntu4) saucy; urgency=low

  * debian/patches/fix-tftp-prototype: pass the right arguments to
    EFI_PXE_BASE_CODE_TFTP_READ_FILE.
  * debian/patches/build-with-Werror: Build with -Werror to catch future
    prototype mismatches.
  * debian/patches/fix-compiler-warnings: Fix remaining compiler
    warnings in netboot.c.
  * debian/patches/tftp-proper-nul-termination: fix nul termination
    errors in filenames passed to tftp.
  * debian/patches/netboot-cleanup: roll-up of miscellaneous fixes to
    the netboot code.
 -- Steve Langasek <steve.langasek at ubuntu.com>   Mon, 23 Sep 2013 00:30:00 -0700

** Changed in: shim (Ubuntu Precise)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1087501

Title:
  Unable to boot unsigned kernel, boot freezes in shim call

Status in “shim” package in Ubuntu:
  Fix Released
Status in “shim” source package in Precise:
  Fix Released

Bug description:
  On a Lenovo x230 with secureboot enabled, I can only boot signed
  kernel.

  Initially this was thought to be a grub2 issue but after investigation
  (added debug code in grub and running with debug=all), it was
  determined that the last thing grub does before the freeze is call a
  shim hook.

  The current workaround is to either disable secureboot or use a signed
  kernel.

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