How can I set up Ubuntu 14.04 to automatically go to the lock screen after a certain time period regardless of activity? (ie to child-lock a machine so s/he's not glued to it all night)

  • If s/he can use the computer unsupervised, s/he can undo anything you can do. This is a people problem, and technical solutions will only have a limited benefit. Have you tried telling him/her that the computer is off-limits after a certain time? – Darth Android Feb 29 '16 at 22:09
  • The person I'm particularly concerned about won't be able to undo anything. (mentally disabled 31 year old) – Kimmels n' Bits Feb 29 '16 at 22:40
  • Maybe turning off the internet at your router after x o'clock might be an option too, wouldn't stop local programs like solitaire or minesweeper though. – Xen2050 Mar 1 '16 at 4:54

Have you tried TimeKpr? It appears to allow you to limit access by time, but I've not tried it personally:

Time Configuration Window

Installation Instructions:

sudo add-apt-repository ppa:mjasnik/ppa
sudo apt-get update
sudo apt-get install timekpr

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