This is probably the same as Bug #277327.
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Guest samba share stops working when winbind is installed
https://bugs.launchpad.net/bugs/278933
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Public bug reported:
Binary package hint: samba
I have a Samba share configured to provide read/write access without
authenticating. This worked fine until I installed Wine. I removed
wine, and it worked fine again. I narrowed the offending package down
to winbind.
The share is configured lik