At present time using separated user account gets very little from a security point of view judging by number of local privilege escalation bugs that are consta

At present time using separated user account gets very little from a security point of view judging by number of local privilege escalation bugs that are constantly found for common Linux setups. In our case if the malicious code will run on those shared boxes, it implies either a bug in ssh or an Ubuntu software update bringing malicious code or an attack through a hacked computer of one of the users. In either case protecting other users from the effect of malicious code on those boxes will be the least of our worries. Yet the separated accounts do have substantial usability overhead.