Hello,
Actually, forget what I said, I must have made a mistake yesturday, in fact I can specify my new snapshot as the default image, then delete my VM and allow it to be recreated. This works like a charm.
Only problem is : this manipulation loses the attribution of a user to a specific VM name, which may cause problems on my network (not sure of that).
I won't take any chance, and for the moment, I have to manually assign each user to his correct old VM name after deleting and recreating them. Is there a way I don't think of to avoid this problem ?
Thanks