Hi i just installed ubuntu 18.10
first boot worked fine but after I reboot

black screen with this message keep comming up

PKCS#7 signature not signed with a trusted key

I have no idea what this is and how to fix it?

  • Try turning off secure boot in your BIOS. You've installed software that isn't signed.. like Nvidia?
    – heynnema
    Mar 9, 2019 at 14:55
  • @heynnema I have the same issue and secure boot I just double checked is disabled. Not sure if it's related but I have a dual GPU (intel/nvidia) laptop
    – Jonathan
    Apr 13, 2019 at 22:47
  • @Jonathan It's probably the nvidia drivers. What version are you running? Does the machine still boot/operate?
    – heynnema
    Apr 13, 2019 at 22:52
  • Same problem here.... Except I've been running for a few months and just updated packages, and booted to this. Do I really need to disable secure boot just to have a working install? Sep 12, 2019 at 3:11


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