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https://blog.it-kb.ru/2017/09/28/workaround-for-error-couldnt-set-service-principals-on-computer-account-att_or_value_exists-serviceprincipalname-when-join-debian-ubuntu-to-active-directory-with-realm-join/
Обходное решение для ошибки регистрации servicePrincipalName (ATT_OR_VALUE_EXISTS) при подключении Debian GNU/Linux Jessie к домену Active Directory с помощью realm join