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Re:Ask HN: What do you want to see in Ubuntu 17.10? by r3bl on Friday March 31, 2017 @10:12AM (#14003948)
elementary OS designed parental control, but in a bit of an opposite way as you've suggested. An administrator can create a new standard account, and restrict its access to the computer. For example, the standard user can log in between 5 PM and 10 PM, can have access to some of the applications restricted (as in, he can't run them) and he can be banned from accessing certain websites (blacklist-only options at the moment).

Not really what you're looking for, but built exactly in a way you want it: available out-of-the-box, tucked into system settings, there in case you need it. Could be of some inspiration to Ubuntu guys.

Re:Ask HN: What do you want to see in Ubuntu 17.10? by richsu-ca on Friday March 31, 2017 @11:35AM (#14004841)
Elementary OS looks real nice!

Lubuntu like all Ubuntu have standard users with limited access and that is what my son has but I am less worried about his access to the computer or to the computer's features than about him seeing ads or things that isn't appropriate for his age.