net ads join -U Admin

Host is not configured as a member server. 
Invalid configuration.  Exiting.... 
Failed to join domain: This operation is only allowed for the PDC of the domain.

[global] 
dos charset = cp866 
unix charset = utf-8 
display charset = utf-8 
workgroup = GALACTICA 
realm = GALACTICA.LOCAL 
netbios name = SATURN 
server string = SQL SERVER 
security = ADS 
auth methods = winbind 
allow trusted domains = No 
password server = mars.galactica.local 
time server = No 
domain master = No 
dns proxy = Yes 
ldap ssl = no 
idmap uid = 10000-20000 
idmap gid = 10000-20000 
winbind enum users = Yes 
winbind enum groups = Yes 
winbind use default domain = Yes 
winbind refresh tickets = Yes 
case sensitive = No 
[distrib] 
path = /home/distrib 
valid users = “@MYDOMAIN\Пользователи домена” 
read list = “@MYDOMAIN\Пользователи домена” 
write list = “@MYDOMAIN\Администраторы домена” 
read only = No 
create mask = 0644 
guest ok = Yes