My opinion generally aligns with those who are saying to talk with them so they have a better understanding and don’t try to be overly strict with parental controls and such.
What I do want to add and don’t see in other comments is that if you want tracking software, you can set up fmd locator. It uses contact whitelisting so if they get a specific text from a whitelisted contact it will automatically text back their location. It isn’t for the use case of constant tracking to see if they’re sneaking out or whatever but if you want something that’s more trust based location sharing.
No. Lubuntu is designed to use very little resources which makes it faster on slow hardware where the os is a lot of the load. If you have fast hardware, regular Ubuntu might use (making this up but the point generally stands) 2%CPU and 3G of RAM and lubuntu would use 1%CPU and 2G of RAM. That would be a much larger boost if you have a much wearer CPU and only 4G of RAM, but you likely wouldn’t notice a difference on fast hardware.
I might do that just to force myself to organize and move files out of downloads.
Fmdlocator. It can auto reply a text with location to whitelisted contacts.