Public bug reported:

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]

** Affects: nvidia-graphics-drivers-340 (Ubuntu)
     Importance: Undecided
         Status: New

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

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

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