sysctl: error: lkrg.pcfi_validate is an unknown key

An error occurs when starting whonix workstation:
sysctl: error: ‘lkrg.pcfi_validate’ is an unknown key
Is it a security risk? How can I fix it?

Most likely LKRG isn’t load?

Learn LKRG.

Please use https://www.whonix.org/wiki/Free_Support_Principle