Q: How to change computer Domain/Workgroup?

1. Read General Notes
2. Read How to install Samba Server for files/folders sharing service?

3. sudo cp /etc/samba/smb.conf /etc/samba/smb.conf_backup
   sudo gedit /etc/samba/smb.conf

4. Find this line

   ...
      workgroup = MSHOME
   ...

5. Replace with the following line

      workgroup = new_domain_or_workgroup

6. Save the edited file (sample)

7. sudo testparm
   sudo /etc/init.d/samba restart