[need help] rkhunter warning: hidden file /usr/share/man/man5/.k5login.5.gz & .k5identity.5.gz

These files are OK, no reason to worry. They are owned by krb5 package, the Kerberos network authentication system.

But you should install another kernel, 5.10 or 5.4 for example, 5.8 is no longer maintained. :wink:
After installing another kernel, boot into it and remove kernel 5.8.

Check regularely Announcements

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