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ssh-vulnkey command

Q. When ever I try to login to my remote Debian Linux server called in013.example.com, I get the following error message in /var/log/auth.log file:

Jul 1 17:04:36 in013 sshd[14447]: Public key 48:de:55:22:xx:yy:zz:yy:xx:yy:zz:yy::88:e8:87:47 blacklisted (see ssh-vulnkey(1))
Jul 1 17:04:36 in013 sshd[14447]: Public key 48:de:55:22:xx:yy:zz:yy:xx:yy:zz:yy::88:e8:87:47 blacklisted (see ssh-vulnkey(1))

I'm using Ubuntu Linux as desktop operating system. How do I fix this error?
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