boot error, cannot upgrade kernel

[Oliver Grawert]

hi,
Am Donnerstag, dem 06.01.2022 um 22:13 -0700 schrieb Gary Aitken:

> Error: file /boot/vmlinuz-5.15.6-091906-generic has invalid signature

this is definitely not a proper ubuntu kernel (looks like some mainline
debug thingie that you do not want to run in production), where did you
get it from ... 

ciao
	oli
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