I create a personal Samba Domain Controller and added some users for my family usage. I created my personal account with wrongly named attribute "userCertificate;binary". When i try to remove wrong user attribute using following command: samba-tool dbcheck --cross-ncs --fix --yes i receive the error below: ERROR: unknown attribute 'userCertificate;binary' in CN=andrea,CN=Users,DC=frati,DC=local Remove unknown attribute userCertificate;binary [YES] ERROR: Failed to remove unknown attribute userCertificate;binary : (65, 'replmd_modify_handle_linked_attribs: attribute userCertificate;binary is not a valid attribute in schema') I'm not able to do that using any other tool like ldapmodify or ldbmodify too.