[Bug 1939306] Re: latest shim-signed fails on Lenovo T480 with Secure boot

[Hannes Erven]

Experienced the same issue on a Thinkpad X1 Gen7, it stops at a blank
screen. While experimenting even disabling SecureBoot was not a reliable
workaround. With "mokutil --set-verbosity true", the stack ends at the
same line as demonstrated by the OP in
https://bugs.launchpad.net/ubuntu/+source/shim-
signed/+bug/1939306/+attachment/5516850/+files/20210809_132455.jpg .

Problem appeared after upgrade vom shim-signed:amd64 1.47+15.4-0ubuntu2
to 1.50+15.4-0ubuntu7 and was solved by downgrading to
1.46+15.4-0ubuntu1 (the 1.47 version is currently not available,
Launchpad lists only 1.50 and 1.46).

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Title:
  latest shim-signed fails on Lenovo T480 with Secure boot

Status in shim-signed package in Ubuntu:
  Confirmed

Bug description:
  As in the summary, the booting process using the latest shim-signed
  fails on Lenovo T480 with the Secure boot enabled: it ends with the
  black screen. When Secure boot is disabled, the booting process
  completes successfully.

  I collected some logs with `sudo mokutil --set-verbosity true` (see
  attachment).

  I confirm that `grubx64.efi` is where expected.

  The workaround is to downgrade the package version:
  sudo apt install shim-signed=1.40.3+15+1533136590.3beb971-0ubuntu1 shim=15+1533136590.3beb971-0ubuntu1

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: shim-signed 1.40.6+15.4-0ubuntu7
  ProcVersionSignature: Ubuntu 5.4.0-80.90-generic 5.4.124
  Uname: Linux 5.4.0-80-generic x86_64
  .proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] Nie ma takiego pliku ani katalogu: '/proc/sys/kernel/moksbstate_disabled'
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: GNOME
  Date: Mon Aug  9 16:05:10 2021
  EFITables:
   sie 09 16:04:39 adrian-laptop kernel: efi: EFI v2.50 by Lenovo
   sie 09 16:04:39 adrian-laptop kernel: efi:  TPMFinalLog=0x6b58a000  SMBIOS=0x6a62c000  SMBIOS 3.0=0x6a629000  ACPI=0x6b5fe000  ACPI 2.0=0x6b5fe014  ESRT=0x6a4b6000  MEMATTR=0x64799018  TPMEventLog=0x5e5ea018 
   sie 09 16:04:39 adrian-laptop kernel: secureboot: Secure boot enabled
   sie 09 16:04:39 adrian-laptop kernel: esrt: Reserving ESRT space from 0x000000006a4b6000 to 0x000000006a4b6100.
   sie 09 16:04:39 adrian-laptop kernel: secureboot: Secure boot enabled
  InstallationDate: Installed on 2018-04-05 (1222 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
  SecureBoot: 6   0   0   0   1
  SourcePackage: shim-signed
  UpgradeStatus: Upgraded to focal on 2020-10-28 (284 days ago)

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