Shows up during system startup. I have admgpu-pro drivers installed
$ dmesg -l err
[    5.888349] PKCS#7 signature not signed with a trusted key
[    6.055765] PKCS#7 signature not signed with a trusted key
[    6.056484] PKCS#7 signature not signed with a trusted key
[    6.131910] PKCS#7 signature not signed with a trusted key
[    6.132236] PKCS#7 signature not signed with a trusted key
[    6.133669] PKCS#7 signature not signed with a trusted key
[    6.133669] PKCS#7 signature not signed with a trusted key
[    6.164078] PKCS#7 signature not signed with a trusted key
[    6.167132] PKCS#7 signature not signed with a trusted key

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers-430 in Ubuntu.
https://bugs.launchpad.net/bugs/1840890

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

Status in nvidia-graphics-drivers-430 package in Ubuntu:
  Confirmed

Bug description:
  After making nvidia drivers available in Ubuntu 18.04 via Ubuntu's
  StableReleaseUpdates (SRU), I expected that all the usual error and
  warning messages reported by `dmesg -l err` and `dmes -l warn` before
  the nvidia drivers's transition to SRU should no longer appear.
  However, I still find them. See below.

  $ dmesg -l err
  [    2.322549] PKCS#7 signature not signed with a trusted key
  [    2.438684] PKCS#7 signature not signed with a trusted key
  [    2.439332] PKCS#7 signature not signed with a trusted key
  [    2.439727] PKCS#7 signature not signed with a trusted key
  [    2.445846] PKCS#7 signature not signed with a trusted key
  $ dmesg -l warn
  [    2.322558] nvidia: loading out-of-tree module taints kernel.
  [    2.322565] nvidia: module license 'NVIDIA' taints kernel.
  [    2.322566] Disabling lock debugging due to kernel taint
  [    2.433159] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  430.26  Tue 
Jun  4 17:40:52 CDT 2019

  Expected outcome: The above error and warning msgs should no longer
  show in dmesg.

  
  $ uname -a 
  Linux Machine 5.0.0-25-generic #26~18.04.1-Ubuntu SMP Thu Aug 1 13:51:02 UTC 
2019 x86_64 x86_64 x86_64 GNU/Linux

  $ dpkg -l | grep nvidia
  ii  libnvidia-cfg1-430:amd64                   430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA binary OpenGL/GLX configuration library
  ii  libnvidia-common-430                       430.40-0ubuntu0~gpu18.04.1     
              all          Shared files used by the NVIDIA libraries
  ii  libnvidia-compute-430:amd64                430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA libcompute package
  ii  libnvidia-compute-430:i386                 430.26-0ubuntu0.18.04.2        
              i386         NVIDIA libcompute package
  ii  libnvidia-decode-430:amd64                 430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA Video Decoding runtime libraries
  ii  libnvidia-decode-430:i386                  430.26-0ubuntu0.18.04.2        
              i386         NVIDIA Video Decoding runtime libraries
  ii  libnvidia-encode-430:amd64                 430.26-0ubuntu0.18.04.2        
              amd64        NVENC Video Encoding runtime library
  ii  libnvidia-encode-430:i386                  430.26-0ubuntu0.18.04.2        
              i386         NVENC Video Encoding runtime library
  ii  libnvidia-fbc1-430:amd64                   430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA OpenGL-based Framebuffer Capture runtime 
library
  ii  libnvidia-fbc1-430:i386                    430.26-0ubuntu0.18.04.2        
              i386         NVIDIA OpenGL-based Framebuffer Capture runtime 
library
  ii  libnvidia-gl-430:amd64                     430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and 
Vulkan ICD
  ii  libnvidia-gl-430:i386                      430.26-0ubuntu0.18.04.2        
              i386         NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and 
Vulkan ICD
  ii  libnvidia-ifr1-430:amd64                   430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA OpenGL-based Inband Frame Readback runtime 
library
  ii  libnvidia-ifr1-430:i386                    430.26-0ubuntu0.18.04.2        
              i386         NVIDIA OpenGL-based Inband Frame Readback runtime 
library
  ii  nvidia-compute-utils-430                   430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA compute utilities
  ii  nvidia-dkms-430                            430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA DKMS package
  ii  nvidia-driver-430                          430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA driver metapackage
  ii  nvidia-kernel-common-430                   430.26-0ubuntu0.18.04.2        
              amd64        Shared files used with the kernel module
  ii  nvidia-kernel-source-430                   430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA kernel source package
  ii  nvidia-prime                               0.8.8.2                        
              all          Tools to enable NVIDIA's Prime
  ii  nvidia-settings                            390.77-0ubuntu0.18.04.1        
              amd64        Tool for configuring the NVIDIA graphics driver
  ii  nvidia-utils-430                           430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA driver support binaries
  ii  xserver-xorg-video-nvidia-430              430.26-0ubuntu0.18.04.2        
              amd64        NVIDIA binary Xorg driver

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