Guest Mode in previous Ubuntu versions was vary useful yet, in 17.10, one gets Standard or Admin. We need Guest mode for several reasons. I have not been able to discover a Lockdown-ClearOnExit Guest Mode solution in 17.10 and therefore use older version - not good. If there is a place to vote on Guest Mode return to 17.10 and/or future versions - count me in. If someone has a solution - please post.