/usr/include/mit-krb5/krb5/ is in krb5-multidev 1.16-2ubuntu0.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mit-krb5/krb5/ccselect_plugin.h
/usr/include/mit-krb5/krb5/certauth_plugin.h
/usr/include/mit-krb5/krb5/clpreauth_plugin.h
/usr/include/mit-krb5/krb5/hostrealm_plugin.h
/usr/include/mit-krb5/krb5/kadm5_auth_plugin.h
/usr/include/mit-krb5/krb5/kadm5_hook_plugin.h
/usr/include/mit-krb5/krb5/kdcpolicy_plugin.h
/usr/include/mit-krb5/krb5/kdcpreauth_plugin.h
/usr/include/mit-krb5/krb5/krb5.h
/usr/include/mit-krb5/krb5/localauth_plugin.h
/usr/include/mit-krb5/krb5/locate_plugin.h
/usr/include/mit-krb5/krb5/plugin.h
/usr/include/mit-krb5/krb5/preauth_plugin.h
/usr/include/mit-krb5/krb5/pwqual_plugin.h