Sudo root permissions

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1

How do I fix this?

chkstat --system --set
Checking permissions and ownerships - using the permissions files
    /etc/permissions
    /etc/permissions.easy
    /etc/permissions.d/postfix
    /etc/permissions.local
setting /usr/bin/sudo to root:root 4755. (wrong permissions 6755)
/usr/bin/sudo: chmod: Operation not permitted
ERROR: not all operations were successful.