Zitat

1. Secure Boot habe ich immer aus

2. Reset Setup Mode gibt es in meinem Bios nicht.

Ok schade, war ein Versuch ...

Habe mal das hier noch gefunden:

Zitat

Integrity: Problem loading X.509 certificate -65

I fixed this message into my laptop BIOS. All you need to do is :

1. Disable the Secure Boot
2. Reset Setup Mode ( this function is in Bios )

After that, just exit Bios and save changes.

This issue comes in some Acer laptops as its BIOS contains two obsolete certificates. The error message is harmless and can be ignored. Some patch is available for Linux kernel to hide this error, but its not part of Ubuntu yet. I have filed a launchpad bug at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1930783.

Den ganzen Artikel gibt es hier