invalid NetBIOS name: cant install fails

[Daniele Cruciani]

in samba4 install phase (postinst) I got:

Administrator password will be set randomly!
ERROR(<class 'samba.provision.InvalidNetbiosName'>): uncaught exception - The name ''DANIELE-SAMSUNG-RC730'' is not a valid NetBIOS name
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in _run
    return self.run(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 398, in run
    use_rfc2307=use_rfc2307, skip_sysvolacl=False)
  File "/usr/lib/python2.7/dist-packages/samba/provision/__init__.py", line 1892, in provision
    sitename=sitename, rootdn=rootdn)
  File "/usr/lib/python2.7/dist-packages/samba/provision/__init__.py", line 514, in guess_names
    raise InvalidNetbiosName(netbiosname)

I can suggest to take the name from somewhere else or normalize someway (before calling this method)

Thank you