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dmesg -t -l err is not clear

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As stated in the chapter 7 - installing new kernel, dmesg should be clean, ended with below error

dark_matter@DarkMatter ~/l/linux_stable (master)> dmesg -t -l err
integrity: Problem loading X.509 certificate -65

I use Ubuntu 20.04 LTS

what may have I done wrong here?

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