[Bug 513427] Re: 'net usershare' returned error 255: net usershare add: cannot convert name "Everyone" to a SID. Invalid parameter.

[Thierry Carrez]

This is usually an issue with the permissions on the folder you're trying to share.
Please attach your /etc/samba/smb.conf
Could you tell us what permissions your shared folder has ?
ls -ld /path/to/shared/folder

Also see https://answers.launchpad.net/ubuntu/+question/85028 which
describes a similar issue

** Changed in: samba (Ubuntu)
   Importance: Undecided => Low

** Changed in: samba (Ubuntu)
       Status: New => Incomplete

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'net usershare' returned error 255: net usershare add: cannot convert name "Everyone" to a SID. Invalid parameter.
https://bugs.launchpad.net/bugs/513427
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