[Samba] update group

[Brad Ching]

Hello:
   I update redhat from 7.2 to 8.0 yesterday.But i find i can not use chgrp command to change folders or files group.And always tell me not find group name in group file. In fact i create all group that i need in redhat7.2 and use it very well.Who know have any problem for redhat8.0 group when i update .
Pls tell me, thank you very much!
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