I'm not sure the log messages are related to the laptop failing to boot.
Let's make this bug just about the laptop failing to boot.

In theory those log messages were bug 1798863, but you already have the
fix for that installed.

** Summary changed:

- PKCS#7 signature not signed with a trusted key
+ With nvidia-340 driver installed it won't boot to SDDM

** Also affects: sddm (Ubuntu)
   Importance: Undecided
       Status: New

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  With nvidia-340 driver installed it won't boot to SDDM

Status in linux package in Ubuntu:
Status in nvidia-graphics-drivers-340 package in Ubuntu:
Status in nvidia-prime package in Ubuntu:
Status in sddm package in Ubuntu:

Bug description:
  It's hard to report this bug on a laptop with this driver installed,
  so I'm reporting this with on my laptop with a much newer NVIDIA
  driver (but not recommended).

  My laptop, Lenovo Z40, has NVIDIA GeForce GT820M.  With nvidia-340
  driver installed it won't boot to SDDM (also tried with LightDM).
  Opening up another TTY is useless because the same message "PKCS#7
  signature not signed with a trusted key" keeps getting spammed.  I had
  to go to recovery to switch to Intel graphics.

  $ lspci
  03:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M 
/ GT 620M/625M/630M/720M] (rev a1)
  ProblemType: Bug
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
   /dev/snd/controlC0:  yamiyukisenpai   2601 F.... pulseaudio
   /dev/snd/controlC1:  yamiyukisenpai   2601 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 18.10
  InstallationDate: Installed on 2018-08-05 (121 days ago)
  InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 
  MachineType: LENOVO 20366
  NonfreeKernelModules: wl
  Package: nvidia-prime 0.8.10
  PackageArchitecture: all
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-12-generic 
root=UUID=3ac3d3b6-dc27-4365-a548-82d3be4e5ac9 ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17
   linux-restricted-modules-4.18.0-12-generic N/A
   linux-backports-modules-4.18.0-12-generic  N/A
   linux-firmware                             1.175.1
  Tags:  cosmic
  Uname: Linux 4.18.0-12-generic x86_64
  UpgradeStatus: Upgraded to cosmic on 2018-10-10 (55 days ago)
  UserGroups: adm cdrom dip kvm lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 07/21/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 9BCN91WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Lancer 4A5
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Z40-70
  dmi.product.family: IDEAPAD
  dmi.product.name: 20366
  dmi.product.sku: LENOVO_MT_20366_BU_idea_FM_Lenovo Z40-70
  dmi.product.version: Lenovo Z40-70
  dmi.sys.vendor: LENOVO

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