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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1806817 Title: PKCS#7 signature not signed with a trusted key To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1806817/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs