Sounds like bug 1798863.

Please run this command to send us more system info:

  apport-collect 1806817

** Changed in: nvidia-graphics-drivers-340 (Ubuntu)
       Status: New => Incomplete

** Changed in: nvidia-prime (Ubuntu)
       Status: New => Incomplete

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

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1806817

Title:
  PKCS#7 signature not signed with a trusted key

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

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.

  [CODE]
  $ lspci
  03:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M 
/ GT 620M/625M/630M/720M] (rev a1)
  [/CODE]

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