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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