When I want to add a public file in a private network I receive the following error message : "« net usershare » a retourné l'erreur 255 : net usershare add: cannot convert name "Everyone" to a SID. Unexpected information received." What does it mean and how could I fix it ? I've tried unsuccessfull the solution read (for example) at : https://ubuntuforums.org/showthread.php?t=825965 Thank you in advance for your help. Regards, Sab UBUNTU 16.04 LTS The Samba version is : 2:4.3.11+dfsg-0ubuntu0.16.04.12 (as called in Synaptic)