I'm on a clean install of Ubuntu Mate 18.04, the system itself is working with no issues, but I am running dmesg to look at errors and warnings. I like to try to get them all dealt with if possible even if they aren't causing obvious issues right now.
I have an Nvidia card running driver 390.48.
I've got most of the issues dealt with, but one that pops up four times says this:
PKCS#7 signature not signed with a trusted key
Here are +/- three lines in dmesg for context for two of the occurrences (the second one actually captures two):
[ 1.157284] ata3: SATA max UDMA/133 abar m2048@0xdf34b000 port 0xdf34b200 irq 126
[ 1.157285] ata4: SATA max UDMA/133 abar m2048@0xdf34b000 port 0xdf34b280 irq 126
[ 1.157535] e1000e 0000:00:1f.6: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[ 1.168128] PKCS#7 signature not signed with a trusted key
[ 1.168135] nvidia: loading out-of-tree module taints kernel.
[ 1.168138] nvidia: module license 'NVIDIA' taints kernel.
[ 1.168138] Disabling lock debugging due to kernel taint
and:
[ 1.175479] nvidia-nvlink: Nvlink Core is being initialized, major device number 238
[ 1.175681] nvidia 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=io+mem
[ 1.175734] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 390.48 Thu Mar 22 00:42:57 PDT 2018 (using threaded interrupts)
[ 1.180047] PKCS#7 signature not signed with a trusted key
[ 1.181035] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms 390.48 Wed Mar 21 23:48:34 PDT 2018
[ 1.181409] PKCS#7 signature not signed with a trusted key
[ 1.181814] [drm] [nvidia-drm] [GPU ID 0x00000100] Loading driver
The line in question is the PKCS line, I understand the driver will "taint" the kernel. From the context it seems like the PKCS warnings are related to the Nvidia driver. Is that expected? This is the driver obtained from the Ubuntu repository, not independently from Nvidia, if that makes a difference. Usually I can look up the Nvidia-specific errors and warnings (which are usually harmless) but this one I didn't find anything.