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
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https://bugs.launchpad.net/bugs/1806817
Title:
PKCS#7 signature not signed with a trusted key
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