pkcs #7 signature not signed with a trusted key

[Sosha]

after install nvidia-drivers-396 and virt-manager, virtualbox package and reboot system, in boot my system show to me this message: "pkcs #7 signature not signed with a trusted key" and system not booting(freeze maybe)
I purged nvidia-driver-396 and virt-manager, virtualbox packages in recovery mode, The problem was resolved temporarily...
i use ubuntu 18.10 development branch, ubuntu is UEFI boot.

same problem when upgrading ubuntu 18.04 to 18.10. and now when reinstalling ubuntu 18.10!

i have nvidia GTX 1050 TI

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1791697/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Sosha (soshaw)]

i have problem with 396 and 390 driver...

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jason Priest (justaperson)]

Also seen this with nvidia-drivers-410 on kernel 4.15.0.36-generic and 4.18.15.

[Sosha (soshaw)]

yeah i same problem with nvidia-drivers-410. i'm really tired.

[Sosha (soshaw)]

i reinstalling ubuntu 18.10, but i have this problem again... now i purged nvidia and problem is solved

[Nichita Uțiu (nikita.utiu)]

I also encountered the problem. This is my setup:

GPU: Nvidia 2080 TI
Kernel: 4.15.0-38-generic
OS: Ubuntu 18.04.1 LTS
Nvidia driver version: 410.72

[Mohd Abbas (mohd-abbas)]

Encountered the same problem!

Machine: MSI GV62 7RD
Processor: Intel® Core™ i7-7700HQ CPU @ 2.80GHz × 8
Graphics: GeForce GTX 1050/PCIe/SSE2
Operating System: Ubuntu 18.10
Kernel: 4.18.0-15-generic